mon (e. 我的想法是,ceph需要具有数据保护. 64 root default -2 1. Create a new storage pool with a name and number of placement groups with ceph osd pool create. You can make a file system on the Block Device and mount this file system on a suitable mount point, for example:. `ceph osd out osd. How can we remove the objects from a pool, without removing the pool. For example, create a user libvirt: On the Ceph Jewel (v10. This is a fairly common scenario. 8 ceph osd rm 8 I am mainly asking because we are dealing with some stuck PGs (incomplete) which are still referencing id "8" in various places. OSDs that existed prior to the upgrade to mimic are working fine. Its main goal is to service object read/write/etc. Ceph is a storage back end for cloud environments. removed a osd node from the cluster using ceph-deploy [ceph-deploy purge , ceph-deploy purgedata ] 3. Remove it entirely. Remove the Ceph OSD from the CRUSH map. 18 kernel from elrepo. It is not well described in the docs. This procedure removes an OSD from a cluster map, removes its authentication key, removes the OSD from the OSD map, and removes the OSD from the ceph. 1 Watch osd data rebalance get done #ceph -w Stop the osd #Service ceph stop osd. For example:. They peer intelligently for replication and recovery without the need of a central conductor. Ceph OSD デーモン が実行していない (つまり, 落ちているとき), Ceph OSD デーモンは Ceph モニタに、自分が down であるとは報告できません。 Ceph モニタ は、 Ceph OSD デーモンを定期的に ping して、それが実行中であるかを確認することがあります。. On Part 5, we ended up with our Ceph cluster up and running, perfectly replicating objects among the nodes. ceph osd setcrushmap -i Changes can be shown with the command ceph osd crush dump. Ceph replace all OSD disk with newer disk process We have 5 OSD servers and every server has 6x500G disk, not some reason these disk not doing well so i am planning to replace with other model which is 2TB disk size ( so 2x2TB disk per OSD nodes). ZFS/RAID/OSD), to remove partition table, boot sector and any OSD leftover the following command should be sufficient. Click the Create: OSD button and click Create to create an OSD. 4 nautilus released September 17, 2019 Rook v1. So, after a reboot of my storage nodes, the Ceph cluster couldn't reach a healthy state showing the following OSD tree: $ ceph osd tree # id weight type name up/down reweight -1 3. 1, Graylog 1. Shrinking a cluster is not supported by Console, but we need to provide a way to remove nodes from the cluster at least on the CLI. 0 as first step. Out OSD : ceph osd out osd. — Metadata Server prevents filesystem operations from consuming resources excessively How does Ceph work?. ceph osd status - units invisible using black background:. Remove each Ceph OSD on the node from the Ceph Storage Cluster. If you execute ceph health or ceph-s on the command line and Ceph returns a health status, the return of a status means that the monitors have a quorum. If we remove LVM, Ceph leads any other storage company by 48%, that is incredible. 5 device 'osd. The latest Tweets from Ceph (@Ceph). 9 # ceph osd crush remove osd. Next, you will add a disk to the Ceph cluster. OUTLINE Ceph RADOS CRUSH functional placement CRUSH hierarchy and failure domains CRUSH rules CRUSH in practice CRUSH internals CRUSH tunables Summary. 1 通用示例 --data-path是指osd的数据目录,比如:/var/lib/ceph/o. A number can be added to specify the number of bytes to be written, the command below writes out 100MB at a rate of 37 MB/s. Latency stats for the osds can be shown with: Individual drive performance can be shown with. 前言之前有写过一篇删除OSD的正确方式,里面只是简单的讲了下删除的方式怎样能减少迁移量,本篇属于一个扩展,讲述了 Ceph 运维当中经常出现的坏盘提换盘的步骤的优化 基础环境两台主机每台主机8个 OSD,一共 16 个 OSD,副本设置为2,PG 数设置为800,计算下来平均每个 OSD 上的 P G数目为100个,本. A Ceph OSD generally consists of one ceph-osd daemon for one storage drive (and its associated journal) within a host machine. ceph osd tree | grep -i down will tell you which OSD is down. 5` 4) remove from crush map. To reduce the number of devices permanently, shut down the ceph LXD, remove the last device from the profile, reboot the host, and verify the ceph-osd charm has the reduced number of devices and started normally. Repeat these steps. We even found osd_client_message_cap may result to live lock among different messages. Tell Ceph to attempt repair of an OSD by calling ceph osd repair with the OSD identifier. Remove OSD : ceph osd rm osd. Temporarily disable scrubbing. 6 with the. This is normal behavior for Ceph Storage. Red Hat encourages all candidates for Red Hat Certified Specialist in Ceph Storage Administration exam (EX125) to consider taking Red Hat Ceph Storage Architecture and Administration (CEPH125) to help prepare. Mark it ‘out’: ceph osd out osd. # It can remove any number of OSD(s) from the cluster and ALL THEIR DATA # Use it like this: # ansible-playbook shrink-osd. I failed to find correct setting to control, how much RAM OSD process is allowed to use. 如果OSD挂了(down)长期( mon osd down out interval ,默认300秒)不恢复,Ceph会将其标记为out,并将其上的PG重新映射到其它OSD. The included dashboards are a good start for Ceph metrics. If I delete it from ceph. wal and block. Ceph: properly remove an OSD Sometimes removing OSD, if not done properly can result in double rebalancing. By default it will adjust the weights downward on OSDs which have 120% of the average utilization, but if you include threshold it will use that percentage instead. Snapshots: When you create snapshots with ceph osd pool mksnap, you effectively take a snapshot of a particular pool. > Yes, John should change order to "ceph auth del" followed by "ceph osd rm" Tanay, If the instructions said to "ceph-deploy osd create" the OSD, it should handle the prepare and activate in one step. The first two disks will be used as a RAID-1 array for the OS and probably journals (still researching on that). Removing a Node Use the following commands to check cluster capacity: # ceph df # rados df # ceph osd df. Remove the OSD. 10 # ceph osd crush remove osd. Remove the partition from the block_db, block_wal, or journal. If you want to remove a Ceph MON node (controller), you do not need to migrate the data before you remove it, as no data is stored on the Ceph MON node. Out OSD : ceph osd out osd. 0 as first step. Legacy value is too small even for hdd under large cluster. Powered by Redmine © 2006-2016 Jean-Philippe Lang. Administrative and control operations are issued from an admin node, which must not necessarily be separated from the Ceph cluster (e. And also install required packages. 5 ## Remove auth for disk ceph auth del osd. __count__/__total__ YouTube TV - More live TV to love. Tell Ceph to attempt repair of an OSD by calling ceph osd repair with the OSD identifier. `ceph osd rm osd. If more than one devices are offered for one bluestore OSD, Kolla Ceph will create partitions for block, block. 本文简单对ceph osd 进程间的心跳机制加以分析。 HeartBeat Messenger. ceph osd tree的可视化 September 19, 2019 v14. The 80 PGs moved to "creating" for a few minutes but then all went back to "incomplete". 8 and no osd. 8 ceph osd rm 8 I am mainly asking because we are dealing with some stuck PGs (incomplete) which are still referencing id "8" in various places. How to increase Ceph OSD journal size Here I will be discussing to increase the journal size from 2GB to 10GB. To change PG size for replica pool, once inside toolbox pod: ceph osd pool set replicapool pg_num 256 ceph osd pool set replicapool pgp_num 256 Rook and Ceph can help teams find cloud native solutions for storage. After this it should be fine. Set Ownership: You can set a user ID as the owner of a pool. They peer intelligently for replication and recovery without the need of a central conductor. Now purge all config files. 如果OSD挂了, Ceph 会把分配到 此 OSD 的归置组都标记为 degraded 。只要它归置组仍然处于active 状态,客户端 仍可以degraded归置组写入新对象. id & gt; The OSD are removed from the cluster, and CRUSH will immediately rebalance the surviving OSDs to guarantee replication rules are complaint. Suppose the osd 2 is down. 3 marked down osd. #When you add or remove Ceph OSD Daemons to a cluster, the CRUSH algorithm will want to rebalance the cluster by moving placement groups to or from Ceph OSD Daemons to restore the balance. ceph osd crush rm-device-class osd. Object storage devices (ceph-osd) that use a direct, journaled disk storage (named BlueStore, since the v12. The ceph charm provides a superset of the functionality of the ceph-osd charm; if you just want to try out a small three node deployment, just use ceph - it will configure MON daemons by default and can also use attached storage for OSD (Object Storage Daemon) as well: juju deploy -n 3 ceph. Ceph Filesystem is a POSIX-compliant file system that uses a Ceph. OUTLINE Ceph RADOS CRUSH functional placement CRUSH hierarchy and failure domains CRUSH rules CRUSH in practice CRUSH internals CRUSH tunables Summary. now on pve storage list contents the disk still shows on both places. ceph osd crush add 4 osd. When I attempt to remove the monitor from the PVE GUI, of course it fails because it's trying to cleanly remove it. Benchmark. Out OSD : ceph osd out osd. Ceph is a powerful distributed storage platform with a focus on spreading the failure domain across disks, servers, racks, pods, and datacenters. How to delete a invalid osd in ceph cluster? Ask Question Asked 2 years, # ceph osd crush remove osd. So you need to provide a disk for the OSD and a path to the journal partition (i. With the help of Ceph, you can build an environment with the desired size. 影响性能的关键部分-ceph的osd journal写. Ceph OSD Daemons write data to the disk and to journals. 4 sudo ceph osd rm 4 WTH, this made no difference. 5` 4) remove from crush map. #This playbook shrinks Ceph OSDs that have been created with ceph-volume. ceph osd setmaxosd 10#设置osd的个数. there is no possibility to remove it with the pve gui, so i have to do it on the command line. Grant root priviledge to Ceph admin user just added above with sudo settings. I have 3 ceph nodes, I have decided to install ceph monitor plus ceph osd on all 3 servers. Of course, I forgot to remove the CEPH monitor before removing the node from the cluster. conf and copy new conf to all hosts Add Monitor node/service. 3 marked down osd. This may also now be a good time for other OS updates and a reboot if required (Run ceph osd set noout first to stop ceph rebalancing when the node goes down and check ceph status to see if the current node is the active MDS and fail it if it is with ceph mds fail $(hostname -s) and then ceph osd unset noout when we’re done. , slow requests) warn about objects with too many omap entries dashboard: rgw section Log when choose_total_tries exceeded config options docs ceph iostat/pgperf [pool] command mon: gate require_min_compat_client on currently connected clients osd "safe to remove" check. Containerized Storage Daemons (CSD) which allows the software-defined storage components (Ceph MON, OSD, MGR, RGW, etc) to run within containers. In that configuration I used only one OSD per CEPH node, in real life you will want to have more OSDs per CEPH node. 8 ceph osd rm 8 I am mainly asking because we are dealing with some stuck PGs (incomplete) which are still referencing id "8" in various places. From: Piers Dawson-Damer Subject: Troubleshooting down OSDs: Invalid command: ceph osd start osd. Disable and stop each ceph instance€and remove each instance from osd and unmount. Ceph would not let us issue "ceph osd lost N" because OSD. As you may know, Ceph is a unified Software-Defined Storage system designed for great performance, reliability, and scalability. Limit back-fill and recovery. ceph osd rm 0#集群删除一个osd硬盘. Wait for the rebalancing to finish and remove the drive. Q&A for Work. How to add SSD for Ceph OSD journal Here I will be discussing to add SSD for OSD journal. A brief overview of the Ceph project and what it can do. 影响性能的关键部分-ceph的osd journal写. Install ceph on the cluster : Before you need to create partition on ssd device (if use seperate journal) For my exemple, I use : sda 1: system partition 2: swap 5: osd journal (10 GB) 6: osd journal (10 GB) 7: osd journal (10 GB) sdb : osd sdc : osd sdd : osd. Ceph will need some physical storage to be used as Object Storage Devices (OSD) and Journal. Adding the OSD. Posts about ceph cluster written by ekuric. Ceph is designed for an infinite number of OSDs and you are free to study reference architectures on what has been done in production. Ask Question Though ceph OSD shows up normally when changing the environment from Ubuntu 14. 'target_max_bytes' and 'target_max_objects' are used to set. I've tried adding the OSD using ceph-deploy, and manually from the OSD host. Kolla Ceph will create two partitions for OSD and block separately. This capability is quite useful for increasing/decreasing logging output, enabling/disabling debug settings, and even for runtime optimization. Ceph OSD Daemons write data to the disk and to journals. migrate are being re-written and are not present up to now (2019-05-06) Known issues: Warning “Ignoring pillar stack template …” should be ignored; OSD deployment (can only deploy standalone OSDs) Other OSD related tasks (report, purge, remove, …) do not work Fixed; ISCSI is disabled (iSCSI can be configured using. Remove OSD : ceph osd rm osd. 1 up 1 -4 1 host storage03 2 1 osd. When using multiple data pools for storing objects, you need to ensure that you balance the number of placement groups per pool with the number of placement groups per OSD so that you arrive at a reasonable total number of placement groups that provides reasonably low variance per OSD without taxing system resources or making the peering. Remove the failed disk from Ceph¶ In the following, {osd-name} indicates the full name of the OSD, like osd. service instances at once€€€€€€€€€€€ Step 5. # systemctl stop ceph-osd@ Back on your management host: $ ceph osd crush remove osd. Ceph Pool PG per OSD – created log We are still working with the cluster to figure out what is the optimal PG setting. To create a storage pool for Block Devices in the OSD, use the following command: # ceph osd pool create datastore 150 150 This example creates a pool named datastore with a placement group value of 150. Trello is the visual collaboration platform that gives teams perspective on projects. One thought on “ Remove objects from Ceph pool without deleting pool ” Donny D December 24, 2016 at 2:07 pm. Stop OSD : ceph osd down osd. But in Nautilus, things have changed. Remove item id 1 with the name 'osd. # 列出所有的OSD ceph osd tree # 删除OSD(这里删除osd. ceph-osd - Installs a Ceph OSD (object storage daemon) which stores data, handles data replication, recovery, rebalancing, and provides some monitoring information to Ceph Monitors. This section describes how to add Ceph Monitor, Ceph OSD, and RADOS Gateway nodes to an existing Ceph cluster or remove them, as well as how to remove or replace Ceph OSDs and upgrade. # ceph-deploy purge mon01 osd01 osd02 osd03. 1:6789 feature set mismatch, my XXXXXX < server's XXXXXX, missing 800000000 —> Remove cache pool and reload monitors or upgrade kernel client up to 3. 查看集群状态 ceph health 集群健康状况 ceph status / ceph -s 集群状态 ceph df 集群空间利用情况 ceph -w 监控集群运行情况 mon&osd启动方式 #monitor start/stop/restart #ceph-1为各个monitor所在节点的主机名。. The Ubuntu OpenStack team at Canonical is pleased to announce the general availability of OpenStack Stein on Ubuntu 18. As the project documentation recommends, for better performance, the Journal should be on a separate drive than the OSD. Filestore Usage: ceph-deploy osd create --data DISK --journal JOURNAL HOST NOTE: For other flags available, please see the man page or the --help menu on ceph-deploy osd create. 1' from the CRUSH map. 影响性能的关键部分-ceph的osd journal写. 3 Exporting Ceph Object Gateway Over NFS 3. there is no possibility to remove it with the pve gui, so i have to do it on the command line. 11 As soon as OSDs are removed from the CRUSH map, the Ceph cluster becomes healthy. I said the documentation was lacking and I take that back, I didn't catch on that the API documentation was built into the application. ceph osd tree的可视化 September 19, 2019 v14. 19): you can remove them or 'mark complete' them. Fixing a Ceph performance WTF. 5 as an example # ceph commands are expected to be run in the rook-toolbox: 1) disk fails: 2) remove disk from node: 3) mark out osd. 1c1; It might look a bit rough to delete an object but in the end it's job Ceph's job to do that. We can be "rados -p cleanup --prefix " to remove all the objects, with a specific prefix. One thought on " Remove objects from Ceph pool without deleting pool " Donny D December 24, 2016 at 2:07 pm. Now remove this failed OSD from Crush Map , as soon as its removed from crush map , ceph starts making PG copies that were located on this failed disk and it places these PG on other disks. My worries is - why Ceph is doing the recovery, if an OSD is already down and no more in the cluster. This homepage contains information about the use of Linux at the BFH Bern University of Applied Sciences. How can we remove the objects from a pool, without removing the pool. This allows you to look at the specific metrics for a single disk. N <<>> ceph osd rm N Check ceph disks on target node:. Out OSD : ceph osd out osd. You can also view the utilization statistics for each pool. OSDs serve stored data to clients. Next, you will add a disk to the Ceph cluster. Remove it (and wave bye-bye to all the data in it) with ceph osd pool delete. 11 As soon as OSDs are removed from the CRUSH map, the Ceph cluster becomes healthy. ceph osd tree | grep -i down will tell you which OSD is down. To get rid of it: $ ceph osd crush remove This keeps your ceph osd tree output. Upgrade CRUSHmap ¶. 8 and no osd. This may also now be a good time for other OS updates and a reboot if required (Run ceph osd set noout first to stop ceph rebalancing when the node goes down and check ceph status to see if the current node is the active MDS and fail it if it is with ceph mds fail $(hostname -s) and then ceph osd unset noout when we’re done. 2 ceph-deploy purge command does not clean up OSD disk volumes or labels. , this is the most common configuration, but you may configure your system to your own needs). 21 #ceph osd crush remove osd. ceph osd crush rm-device-class osd. Specifically in the preuninstall scriptlet in the ceph-osd rpm, "systemctl stop ceph-disk@\*. However, getting started with Ceph has typically involved the administrator learning automation products like Ansible first. Rook allows creation and customization of storage clusters through the custom resource definitions (CRDs). If your host has multiple storage drives, you may map one ceph-osd daemon for each drive. ceph-deploy mon destroy [] For example, to remove Ceph monitors on monitor hosts node5 and node6, you would execute the following: ceph-deploy mon destroy node5 node6. Ceph distributed storage system. So, after a reboot of my storage nodes, the Ceph cluster couldn't reach a healthy state showing the following OSD tree: $ ceph osd tree # id weight type name up/down reweight -1 3. Object storage devices (ceph-osd) that use a direct, journaled disk storage (named BlueStore, since the v12. Ceph: properly remove an OSD Sometimes removing OSD, if not done properly can result in double rebalancing. ZFS/RAID/OSD), to remove partition table, boot sector and any OSD leftover the following command should be sufficient. ceph osd pause#暂停osd (暂停后整个集群不再接收数据). OSD Config Reference¶ You can configure OSDs in the Ceph configuration file, but OSDs can use the default values and a very minimal configuration. 3 removed item id 3 name 'osd. ceph osd tier remove-overlay Subcommand set-overlay set the overlay pool for base pool to be. Preparing the storage. Remove the OSD authentication key. 8) in which power outages caused a failure of two OSDs. As the project documentation recommends, for better performance, the Journal should be on a separate drive than the OSD. 本文简单对ceph osd 进程间的心跳机制加以分析。 HeartBeat Messenger. From the Ceph administration node, or from any Ceph server: if the noout flag is set, most likely the Ceph cluster will be in warning state, showing PG in inconsistent/degraded state and possibly showing unfound objects. ceph-deploy will make it and everything runs nice, expcet that for each of 3 OSDs 1 tmpfs partition is being created, which is 2gb and after copying ~50gb of data to CephFS Bluestore - box starts agressively using RAM and ends up with using all the swap. sudo -u ceph ceph-mon --mkfs -i mon1 --monmap /tmp/monmap --keyring /tmp/ceph. I tried setting up clusters with both btrfs and xfs,. ceph-deploy osd create --data DISK HOST. In syslog i see:. Remove the partition from the block_db, block_wal, or journal. com This was hard-coded to ceph. You can configure OSDs in the Ceph configuration file, but OSDs can use the default values and a very minimal configuration. create it before updating the crush map One solution for this is to start the OSD's yourself: ceph-osd -i 0 -c /etc/ceph/ceph. 08800 pool=ssd_root rack=ssd_rack01 host=ssd_ceph4 ceph osd crush remove {name} 该步骤会触发数据的重新分布。. When using multiple data pools for storing objects, you need to ensure that you balance the number of placement groups per pool with the number of placement groups per OSD so that you arrive at a reasonable total number of placement groups that provides reasonably low variance per OSD without taxing system resources or making the peering. Wait that the status is HEALTH-OK. Ceph is a massively scalable, open source, distributed storage system. Remove OSD : ceph osd rm osd. 5` 5) delete caps. Now remove this failed OSD from Crush Map , as soon as its removed from crush map , ceph starts making PG copies that were located on this failed disk and it places these PG on other disks. # ceph-deploy purge mon01 osd01 osd02 osd03. 11:6789/0}, election epoch 1, quorum 0 controller osdmap e82: 15 osds: 4 up, 2 in pgmap v3037: 448 pgs, 5 pools, 197 MB data, 60 objects 10313 MB used, 4828 GB / 4838 GB avail 192 stale+active. Out OSD : ceph osd out osd. Limit back-fill and recovery. " />

Ceph Remove Osd

#This playbook shrinks Ceph OSDs that have been created with ceph-volume. A Ceph cluster requires these Ceph components: Ceph OSDs (ceph-osd) - Handles the data store, data replication and recovery. I'm not able to start newly added OSDs at all, even if I use a new ID. Basic Write pipeline Prepare (Allocate) Commit Metadata Write Data. In example below, remove the new osd. Stop OSD : ceph osd down osd. Current journal size is set as "2GB" and will see the process of how to increase the journal size to "10GB". Upgrade CRUSHmap ¶. At the begning, we have 2 pools : the current “testpool”, and the new one “newpool” Setup cache tier Configure the existing pool as cache pool : 1 2 ceph osd tier add newpool testpool --force-nonempty ceph osd tier cache-mode testpool forward In ceph osd dump you should see something like that : --> pool 58 'testpool' replicated size 3. Wait until the Ceph cluster is in a healthy state if WAIT_FOR_HEALTHY was selected. 2 ceph osd crush remove osd. Shutdown Ceph OSD 3; ceph osd lost 4 --yes-i-really-mean-it; 但是很遺憾,怎麼做就是沒有任何效果。 如果執行 ceph pg scrub 0. alibaba-inc. 10 # ceph osd crush remove osd. You only need to do this once, afterwards the automated start script from ceph will work. ceph osd crush rm-device-class osd. conf ( if its present. Administrative and control operations are issued from an admin node, which must not necessarily be separated from the Ceph cluster (e. Generally, it’s a good idea to check the capacity of your cluster to see if you are reaching the upper end of its capacity. OK, it's gone from ceph osd tree , but ceph pg dump_stuck stale still reports a problem with a placement group on "[4]". Look into OSD list (ceph osd tree). If you want to remove a Ceph MON node (controller), you do not need to migrate the data before you remove it, as no data is stored on the Ceph MON node. Ceph OSD always 'down' in Ubuntu 14. ZFS/RAID/OSD), to remove partition table, boot sector and any OSD leftover the following command should be sufficient. tasks/workunit: remove kludge to use git. In this section we will see how to configure that. ceph osd out osd. In this tutorial, I will guide you to install and build a Ceph cluster on CentOS 7. db according to the partition labels. This section describes how to add Ceph Monitor, Ceph OSD, and RADOS Gateway nodes to an existing Ceph cluster or remove them, as well as how to remove or replace Ceph OSDs and upgrade. ceph osd rm {osd-num} #for example ceph osd rm 1. 14 umount / var / lib / ceph / osd / ceph-14. Verify that the nodes are in the HEALTH_OK status after each Ceph Monitor restart. I'm not able to start newly added OSDs at all, even if I use a new ID. Object storage devices (ceph-osd) that use a direct, journaled disk storage (named BlueStore, since the v12. 1: Ceph CSI, Bucket Provisioning, External Clusters, and much more!. Temporarily disable scrubbing. ceph-deploy will make it and everything runs nice, expcet that for each of 3 OSDs 1 tmpfs partition is being created, which is 2gb and after copying ~50gb of data to CephFS Bluestore - box starts agressively using RAM and ends up with using all the swap. And also install required packages. To organize data into pools, you can list, create, and remove pools. Ceph: properly remove an OSD. ceph osd crush add 4 osd. CEPH distributed file system discussion archive. Summary of some ops-oriented Ceph commands (using Jewel, might or might not work with others) Monitoring and Health · Working with Pools and OSDs · Working with Placement Groups · Interact with individual daemons · Authentication and Authorization · Object Store Utility · RBD Block Storage · Runtime Configurables. Note that I am in /root/ceph-deploy on my monitor/admin server. 14 ceph osd rm osd. Ceph distributed storage system. Latency stats for the osds can be shown with: Individual drive performance can be shown with. 0 ceph osd crush remove osd. The best practice to remove an OSD involves changing the crush weight to 0. N <<>> ceph auth del osd. Remove the OSD. Attendance in these classes is not required; students can choose to take just the exam. x release) or store the content of files in a filesystem (preferably XFS, the storage is named Filestore) Metadata servers (ceph-mds) that cache and broker access to inodes and directories inside a CephFS filesystem. How can we remove the objects from a pool, without removing the pool. Protecting your Ceph pools against removal or property changes One of the dangers of Ceph was that by accident you could remove a multi TerraByte pool and loose all the data. # It can remove any number of OSD(s) from the cluster and ALL THEIR DATA # Use it like this: # ansible-playbook shrink-osd. 8 Date: Dec 7, 2015 Overview Before investing to commercial monitoring software, I decided to use open source product and final choice is Icinga for monitoring, Graylog for log collection, and Cacti for graph. The Ceph cluster is built on the basis of distributing the load of the service in multiple nodes where the OSDs, the basic building block of any Ceph cluster, are housed. debug log from ceph OSD (please ignore if you googled to this) - ceph osd debug log. N is on ceph-nodeXX * OSD data disk is `/dev/sdX` on ceph-nodeXX * OSD journal should be created on `/dev/nvme0n1pY` on ceph-nodeXX Remove OSD from ceph (shortly before setting up replacement): <<>> ceph osd crush remove osd. Is this a problem with the _packaging_ in Fedora? (It doesn't seem like it. Specifically in the preuninstall scriptlet in the ceph-osd rpm, "systemctl stop ceph-disk@\*. 2, OS is Centos 7 with the 4. 4 nautilus released September 17, 2019 Rook v1. I failed to find correct setting to control, how much RAM OSD process is allowed to use. ceph osd getcrushmap -o backup-crushmap ceph osd crush set-all-straw-buckets-to-straw2 If there are problems, you can easily revert with: ceph osd setcrushmap -i backup-crushmap Moving to 'straw2' buckets will unlock a few recent features, like the crush-compat balancer mode added back in Luminous. 3 After each node has been upgraded, wait until the status goes back to HEALTH_OK. 1 Watch osd data rebalance get done #ceph -w Stop the osd #Service ceph stop osd. The command for that is: ceph osd crush remove osd. 1 up 1 -4 1 host storage03 2 1 osd. I removed a PVE cluster node that was also a CEPH monitor (no OSD, just MON). Essentially we traverse the servers (nodes) and ceph osd instances throughout the cluster, collecting files (with find) that match the wildcard and are bigger than a byte. 前回、CephクラスタにOSDを追加していたが、今回はそのうちの1台をクラスタから切り離してみる。 1. 2, OS is Centos 7 with the 4. 1:6789 feature set mismatch, my XXXXXX < server's XXXXXX, missing 800000000 —> Remove cache pool and reload monitors or upgrade kernel client up to 3. 0) ceph osd out osd. Benchmark. conf ( if its present. ceph-fs - Installs a Ceph Metadata Server which stores metadata on behalf of the Ceph Filesystem. Grant root priviledge to Ceph admin user just added above with sudo settings. 5 as an example # ceph commands are expected to be run in the rook-toolbox: 1) disk fails: 2) remove disk from node: 3) mark out osd. With the help of Ceph, you can build an environment with the desired size. 1 (was deleted already) In some cases i had to manually delete the old Osd folder in /var/lib/ceph/ (removed folder an retired creating the OSD) =. To clean up this status, remove it from CRUSH map: ceph osd crush rm osd. Disable and stop each ceph instance€and remove each instance from osd and unmount. Remove Authentication : ceph auth del osd. Ceph OSD デーモン が実行していない (つまり, 落ちているとき), Ceph OSD デーモンは Ceph モニタに、自分が down であるとは報告できません。 Ceph モニタ は、 Ceph OSD デーモンを定期的に ping して、それが実行中であるかを確認することがあります。. A CRASH COURSE IN CRUSH Sage Weil Ceph Principal Architect 2016-06-29 2. Rogue Ceph OSD not assigned to a host. OSD Config Reference¶ You can configure OSDs in the Ceph configuration file, but OSDs can use the default values and a very minimal configuration. To create a storage pool for Block Devices in the OSD, use the following command: # ceph osd pool create datastore 150 150 This example creates a pool named datastore with a placement group value of 150. The first two disks will be used as a RAID-1 array for the OS and probably journals (still researching on that). Remove OSD : ceph osd rm osd. log to establish whether it's a normal reaction to a bad disk. At the begning, we have 2 pools : the current "testpool", and the new one "newpool" Setup cache tier Configure the existing pool as cache pool : 1 2 ceph osd tier add newpool testpool --force-nonempty ceph osd tier cache-mode testpool forward In ceph osd dump you should see something like that : --> pool 58 'testpool' replicated size 3. First remove all CEPH rpms from your CEPH hosts, this includes Monitor nodes and OSD nodes. The values specified in ceph osd pool create scbench 100 100. Should you not have any OSD Pod, make sure all your Nodes are Ready and schedulable (e. The osd daemon is also run as a side effect of udev detecting the disk and calling /etc/init/ceph-osd. Basic Installation Steps to install Ceph Mimic on CentOS 7. add/remove CEPH OSD – Object Storage Device In blog post Install CEPH cluster – OS Fedora 23 is described how to setup CEPH storage cluster based on Fedora 23. Till here everything was fine, I was even able. If more than one devices are offered for one bluestore OSD, Kolla Ceph will create partitions for block, block. To remove a Ceph OSD node: (Controller node) Find the ID of the Ceph OSD node you want to remove. A Ceph Monitor maintains maps of the cluster state, including the monitor map, the OSD map, the Placement Group (PG) map, and the CRUSH map. < id >", which started the recovery. Please note: in the real life you should be really. 1 x Xeon 4116. Repeat till all the drives have been replaced. Shutdown Ceph OSD 3; ceph osd lost 4 --yes-i-really-mean-it; 但是很遺憾,怎麼做就是沒有任何效果。 如果執行 ceph pg scrub 0. 3 update, redeploy the failed Ceph OSD. Adding and removing Ceph OSD Daemons to your cluster may involve a few more steps when compared to adding and removing other Ceph daemons. If you want to remove a Ceph MON node (controller), you do not need to migrate the data before you remove it, as no data is stored on the Ceph MON node. OSD Config Reference¶ You can configure OSDs in the Ceph configuration file, but OSDs can use the default values and a very minimal configuration. ceph osd status - units invisible using black background:. N <<>> ceph osd rm N Check ceph disks on target node:. 简介 ceph提供的一个操作pg及pg里面的对象的工具。 2. Attendance in these classes is not required; students can choose to take just the exam. We will share with you all the lessons we've learned the hard way when operating our two Ceph clusters. After you successfully deploy a Ceph cluster, you can manage its nodes and object storage daemons (Ceph OSDs). ceph osd crush remove 8 ceph auth del osd. The previous Rook Ceph cluster is not running. How to increase Ceph OSD journal size Here I will be discussing to increase the journal size from 2GB to 10GB. Fixing a Ceph performance WTF. Adding and removing Ceph OSD Daemons to your cluster may involve a few more steps when compared to adding and removing other Ceph daemons. If I delete it from ceph. Luminous – Remove OSDs $ ceph osd out 1 $ systemctl stop ceph-osd@1. So far, we have installed Ceph on all the cluster nodes. 1’ from the CRUSH map. In example below, remove the new osd. First remove all CEPH rpms from your CEPH hosts, this includes Monitor nodes and OSD nodes. It is not well described in the docs. Ceph OSD Daemons write data to the disk and to journals. The Ceph - replace failed OSD pipeline workflow: Mark the Ceph OSD as out. Replace `` with above captured failed OSD ID: utilscli osd-maintenance osd_remove_by_id --osd-id utilscli osd-maintenance osd_remove_by_id --osd-id Remove the failed drive and replace it with a new one without bringing down the node. ceph-osd - Installs a Ceph OSD (object storage daemon) which stores data, handles data replication, recovery, rebalancing, and provides some monitoring information to Ceph Monitors. ceph-osd is the storage daemon that runs on every storage node (object server) in the Ceph cluster. x release) or store the content of files in a filesystem (preferably XFS, the storage is named Filestore) Metadata servers (ceph-mds) that cache and broker access to inodes and directories inside a CephFS filesystem. How to increase Ceph OSD journal size Here I will be discussing to increase the journal size from 2GB to 10GB. ceph tell 'osd. To remove a Ceph OSD node: ( Controller node ) Find the ID of the Ceph OSD node you want to remove. 5` 6) remove osd. A brief overview of the Ceph project and what it can do. wal and block. ceph osd set noout ceph osd set norebalance Restart the Ceph Monitor services on the cmn nodes one by one. 1、在不同节点安装ceph时,出现以下异常:参考这里 解决方法: 执行以后再执行 2、ceph用户没有权限**执行激活osd盘时出现 ** 解决方法 3、RuntimeErr. At least one Ceph mon db is in quorum, and sufficient number of Ceph OSD is up and in before disaster. Of course the above works well when you have 3 replicas when it is easier for Ceph to compare two versions against another one. Conceptual Ceph System Model Gateway OSD Media OSD Update KV to remove data and WAL operation. 0 ceph auth del osd. This is normal behavior for Ceph Storage. 04 to CentOS 6. Rook allows creation and customization of storage clusters through the custom resource definitions (CRDs). It is worth noting that while Proxmox VE and Ceph will create a functioning pool automatically, it is likely best to save your logging SSD some writes and ensure you have a better number of PGs per pool. 5' does not appear in the crush map [root@dev. When removing an OSD node from a Ceph cluster Red Hat recommends removing one OSD at a time within the node and allowing the cluster to recover to an active+clean state before proceeding to the next OSD. —> Upgrade kernel client up to 3. Remove 'ceph-deploy osd activate' Remove Exec['ceph-deploy osd activate'] because the same is done by Service['ceph'], that is more preferable. Awesome little script, this helps me cleanup after a failed openstack deployment. The values specified in ceph osd pool create scbench 100 100. 3 to scrub,然後就沒下文了。而 deep-scrub 與 repair 也是一樣的狀況。 正當要準備放棄時,忽然靈機一動,調整了一下指令的. Upgrade CRUSHmap ¶. 2 ceph osd rm 2. log to establish whether it's a normal reaction to a bad disk. nwatkins@issdm-9:~$ rados -p iod1 bench 60 write Maintaining 16 concurrent writes of 4194304 bytes for up to 60 seconds or 0 objects Object prefix:. Steps to replace a failed osd. #ceph-deploy osd prepare osd01:sdb:sde osd01:sdc:sde osd01:sdd:sde Unfortunately, the command below kept failing, stating that it was unable to create some of the partitions on each disk, while creating partitions on some of the disk, and mounting them locally. For some reason a ceph disk lists as on 2 different ceph storage. Basic Installation Steps to install Ceph Mimic on CentOS 7. This is normal behavior for Ceph Storage. Ask Question ceph osd out 2 service ceph stop osd. < id >", which started the recovery. If I delete it from ceph. 19): you can remove them or ‘mark complete’ them. Mark it as ‘down’: ceph osd down osd. OSD Node Hardware: SSG-5029P-E1CTR12L. 1 down 0 -3 1. db according to the partition labels. Ceph maintains a history (called an “epoch”) of each state change in the Ceph Monitors, Ceph OSD Daemons, and PGs. 9 # ceph osd crush remove osd. This allows you to look at the specific metrics for a single disk. Next, you will add a disk to the Ceph cluster. I'm not able to start newly added OSDs at all, even if I use a new ID. The force reuse flag isn’t needed unless you’re dealing with a dirty osd-pool (pre-existing and not empty) which wouldn’t be recommended. Before troubleshooting your OSDs, check your monitors and network first. # ceph osd set noscrub # ceph osd set nodeep-scrub. ceph osd crush add 4 osd. 1 (it was already out) 3. A quick guide for installing Ceph on a single node for demo purposes. 5` 4) remove from crush map. 0 down 0 1 0. Its main goal is to service object read/write/etc. It is worth noting that while Proxmox VE and Ceph will create a functioning pool automatically, it is likely best to save your logging SSD some writes and ensure you have a better number of PGs per pool. ceph osd reweight {osd-num} {weight} Reweights all the OSDs by reducing the weight of OSDs which are heavily overused. Ceph Pool PG per OSD - created log We are still working with the cluster to figure out what is the optimal PG setting. ceph osd pool create one 128 ceph osd lspools 0 data,1 metadata,2 rbd,6 one, Define a Ceph user to access the datastore pool; this user will also be used by libvirt to access the disk images. Prerequisites: - Ceph cluster should be health "OK" state - All placement groups (PGs) should be "active + clean" - Set ceph osd noout to stop the rebalancing activity. ceph-osd - Installs a Ceph OSD (object storage daemon) which stores data, handles data replication, recovery, rebalancing, and provides some monitoring information to Ceph Monitors. Hi Micheal, ceph -s: cluster ea296c34-e9b0-4a53-a740-f0b472f0c81d health HEALTH_WARN 44 pgs degraded 64 pgs stale 44 pgs stuck degraded 64 pgs stuck inactive 64 pgs stuck stale 128 pgs stuck unclean 44 pgs stuck undersized 44 pgs undersized too many PGs per OSD (1246 > max 300) pool rbd pg_num 128 > pgp_num 64 monmap e1: 1 mons at {vltiobjmonmi001=192. sudo -u ceph ceph-mon --mkfs -i mon1 --monmap /tmp/monmap --keyring /tmp/ceph. This is part one - Part Two. 2 days ago · A few weeks ago, we launched a beta for AWS Europe support and received great feedback from our community. By default it will adjust the weights downward on OSDs which have 120% of the average utilization, but if you include threshold it will use that percentage instead. ceph osd in osd. The order of the devices does not matter since ceph will identify the drives by the osd id on the drive itself. Replace `` with above captured failed OSD ID: utilscli osd-maintenance osd_remove_by_id --osd-id utilscli osd-maintenance osd_remove_by_id --osd-id Remove the failed drive and replace it with a new one without bringing down the node. Bringing an OSD out and down from a Ceph cluster Before proceeding with a cluster's size reduction or scaling it down, make sure the cluster has enough free space to accommodate all the data present on the node you are moving out. # systemctl stop ceph-osd@ Back on your management host: $ ceph osd crush remove osd. ceph osd rm {osd-num} #for example ceph osd rm 1. 1 ceph-deploy tool not compatible with previous releases 4. Each disk creates to as an OSD in Ceph which is a storage object used later by the Ceph storage pool. We will be upgrading OSD by first removing it from the cluster and then letting Ceph recover the data onto the new BlueStore OSD. 0 as first step. In example below, remove the new osd. How can we remove the objects from a pool, without removing the pool. In that configuration I used only one OSD per CEPH node, in real life you will want to have more OSDs per CEPH node. Stop OSD : ceph osd down osd. Unmount data partition(s) of the failed disk. Shows you how can you monitor ceph monitors (mon) and ceph storage (osd) using ceph command line tools. Basic knowledge of ceph cluster storage is prerequisite for. 0 ceph osd crush remove osd. Similarly, OSD::osr_registry ensures that the OpSequencers for those pgs can be reused for a new pg if created before the old one is fully removed, ensuring that operations on the new pg are sequenced properly with respect to operations on the old one. Grant root priviledge to Ceph admin user just added above with sudo settings. Adding and removing Ceph OSD Daemons to your cluster may involve a few more steps when compared to adding and removing other Ceph daemons. To remove a Ceph OSD node (storage), you should first migrate the data from the node, then remove the node from the Ceph cluster. x release) or store the content of files in a filesystem (preferably XFS, the storage is named Filestore) Metadata servers (ceph-mds) that cache and broker access to inodes and directories inside a CephFS filesystem. Troubleshooting OSDs and PGs¶. debug log from ceph OSD (please ignore if you googled to this) - ceph osd debug log. Ceph is build to provide a distributed storage system without a single point of failure. After this it should be fine. Latency stats for the osds can be shown with: Individual drive performance can be shown with. Out OSD : ceph osd out osd. If you have separate admin and monitor nodes then run these commands from your admin node. In that configuration I used only one OSD per CEPH node, in real life you will want to have more OSDs per CEPH node. When I inserted disk back device was renamed from /dev/sda to /dev/sdd. ceph-deploy osd prepare ceph-osd1:/dev/sdb ceph-osd2:/dev/sdb ceph-osd3:/dev/sdb. 4 nautilus released September 17, 2019 Rook v1. Ceph creates the Block Device under /dev/rbd/pool/volume. 11:6789/0}, election epoch 1, quorum 0 controller osdmap e82: 15 osds: 4 up, 2 in pgmap v3037: 448 pgs, 5 pools, 197 MB data, 60 objects 10313 MB used, 4828 GB / 4838 GB avail 192 stale+active. ceph osd rm 0#集群删除一个osd硬盘. Remove OSD : ceph osd rm osd. , this is the most common configuration, but you may configure your. The "wildcard" is the key, "13f2a30976b17" which is defined as replicated header file names for each rbd image on your ceph cluster. Hi Micheal, ceph -s: cluster ea296c34-e9b0-4a53-a740-f0b472f0c81d health HEALTH_WARN 44 pgs degraded 64 pgs stale 44 pgs stuck degraded 64 pgs stuck inactive 64 pgs stuck stale 128 pgs stuck unclean 44 pgs stuck undersized 44 pgs undersized too many PGs per OSD (1246 > max 300) pool rbd pg_num 128 > pgp_num 64 monmap e1: 1 mons at {vltiobjmonmi001=192. 2 removed item id 2 name ' osd. Admin Guide :: Replacing a Failed Disk in a Ceph Cluster Replacing a Failed Disk from Ceph a Cluster. 8) in which power outages caused a failure of two OSDs. Upgrade CRUSHmap ¶. Use Trello to collaborate, communicate and coordinate on all of your projects. By default it will adjust the weights downward on OSDs which have 120% of the average utilization, but if you include threshold it will use that percentage instead. 1 Watch osd data rebalance get done #ceph -w Stop the osd #Service ceph stop osd. Removing the OSD Remove the OSD from the CRUSH map so that it no longer receives data. You only need to do this once, afterwards the automated start script from ceph will work. Adding and removing Ceph OSD Daemons to your cluster may involve a few more steps when compared to adding and removing other Ceph daemons. But in Nautilus, things have changed. CEPH - Supprimer un OSD proprement Posté le 22 novembre 2018 1 décembre 2018 par Admin Malin Lors du remplacement d'un OSD défectueux dans un cluster CEPH, il est nécessaire de le supprimer complètement. # It can remove any number of OSD(s) from the cluster and ALL THEIR DATA # Use it like this: # ansible-playbook shrink-osd. 2x Xeon 4116. As you may know, Ceph is a unified Software-Defined Storage system designed for great performance, reliability, and scalability. service ceph-osd@\*. * OSD to be replaced is OSD. 08800 pool=ssd_root rack=ssd_rack01 host=ssd_ceph4 ceph osd crush remove {name} 该步骤会触发数据的重新分布。. Verify that the nodes are in the HEALTH_OK status after each Ceph Monitor restart. So in the end, this will give you: Then you wait for rebalance to be completed. Luminous – Remove OSDs $ ceph osd out 1 $ systemctl stop ceph-osd@1. When the OSD gets marked out, other OSDs with copies of the failed OSD's data will begin backfilling to ensure that the required number of copies exist within the cluster. Subcommand list lists devices associated to Ceph as part of an OSD. After you successfully deploy a Ceph cluster, you can manage its nodes and object storage daemons (Ceph OSDs). 14 umount / var / lib / ceph / osd / ceph-14. 0 service ceph stop osd. Installing Icinga 2. The command for that is: ceph osd crush remove osd. ceph-deploy osd prepare ceph-osd1:/dev/sdb ceph-osd2:/dev/sdb ceph-osd3:/dev/sdb. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. It is not well described in the docs. 5' does not appear in the crush map [root@dev. So far, we have installed Ceph on all the cluster nodes. The program is called cn for Ceph Nano, is available on github let me give you a tour of what it does. ceph osd tree的可视化 September 19, 2019 v14. 2 down 0 3 0. 0 down 0 1 0. — Determines which OSD stores the placement groups — Enables scaling, rebalancing, and recovery dynamically Ceph File System — POSIX-compliant interface — Files are mapped to objects and stored in the Ceph Storage Cluster. A minimal OSD configuration sets osd journal size and osd host, and uses default values for nearly everything else. Object storage devices (ceph-osd) that use a direct, journaled disk storage (named BlueStore, since the v12. Repeat till all the drives have been replaced. `ceph osd out osd. Remove OSD : ceph osd rm osd. Ceph’s RADOS Block Device (RBD) provides access to block device images that are striped and replicated across the entire storage cluster. 14 systemctl stop ceph-osd @ 14. To remove a Ceph OSD node: ( Controller node ) Find the ID of the Ceph OSD node you want to remove. sudo -u ceph ceph-mon --mkfs -i mon1 --monmap /tmp/monmap --keyring /tmp/ceph. 简介 ceph提供的一个操作pg及pg里面的对象的工具。 2. I'm not able to start newly added OSDs at all, even if I use a new ID. Mark it as ‘down’: ceph osd down osd. Ceph is a massively scalable, open source, distributed storage system. A number can be added to specify the number of bytes to be written, the command below writes out 100MB at a rate of 37 MB/s. some Ceph OSDs are bluestore, the others are filestore. ceph osd tier cache-mode {cachepool} none. You can make a file system on the Block Device and mount this file system on a suitable mount point, for example:. The Ceph charm itself is receiving limited maintenance and all new features are being added to the ceph-osd or ceph-mon charms. Kolla Ceph will create two partitions for OSD and block separately. Shutdown Ceph OSD 3; ceph osd lost 4 --yes-i-really-mean-it; 但是很遺憾,怎麼做就是沒有任何效果。 如果執行 ceph pg scrub 0. Object storage devices (ceph-osd) that use a direct, journaled disk storage (named BlueStore, since the v12. Ceph comes with plenty of documentation here. The order of the devices does not matter since ceph will identify the drives by the osd id on the drive itself. You should also observe the OSD map; since we have not removed the OSDs, it will show as 12 OSD, 9 UP, 9 IN :. # docker exec -it ceph_mon ceph osd tree # id weight type name up/down reweight -1 3 root default -2 1 host storage01 0 1 osd. You can also get the crushmap, de-compile it, remove the OSD, re-compile, and upload it back. Removing the OSD Remove the OSD from the CRUSH map so that it no longer receives data. Tell Ceph to attempt repair of an OSD by calling ceph osd repair with the OSD identifier. This section describes how to add Ceph Monitor, Ceph OSD, and RADOS Gateway nodes to an existing Ceph cluster or remove them, as well as how to remove or replace Ceph OSDs and upgrade. ceph osd tree的可视化 September 19, 2019 v14. The first two disks will be used as a RAID-1 array for the OS and probably journals (still researching on that). 9 # ceph osd crush remove osd. juju deploy -n 3 ceph-osd juju deploy ceph-mon --to lxd:0 juju add-unit ceph-mon --to lxd:1 juju add-unit ceph-mon --to lxd:2 juju add-relation ceph-osd ceph-mon Once the 'ceph-mon' charm has bootstrapped the cluster, it will notify the ceph-osd charm which will scan for the configured storage devices and add them to the pool of available storage. Ceph Cheatsheet. 在一个运行的 ceph 集群里添加一个 osd 要依次创建数据目录,把硬盘挂载到数据目录,把 OSD 加入集群,然后把 OSD 加入 CRUSHMAP, ceph 集群尽量使用统一 硬件,如果新增容量不一的磁盘,创建过程中还需调整它的权重。. Create a new storage pool with a name and number of placement groups with ceph osd pool create. It almost goes without saying that this is for tire-kickers who just want to test out the software. ceph auth del osd. ceph之osd的更多相关文章. 3 ceph osd crush set-device-class ssd osd. Suppose the osd 2 is down. [root@controller my-cluster]# ceph -s cluster fcf53ba1-52ed-4551-b903-7ce1bccfa82e health HEALTH_WARN 192 pgs stale; 192 pgs stuck stale; 192 pgs stuck unclean monmap e1: 1 mons at {controller=10. By default it will adjust the weights downward on OSDs which have 120% of the average utilization, but if you include threshold it will use that percentage instead. Repair an OSD: ceph osd repair Ceph is a self-repairing cluster. It is required to use suffixes (_42, _FOO, _FOO42,. When you have a cluster up and running, you may add OSDs or remove OSDs from the cluster at runtime. How to add SSD for Ceph OSD journal Here I will be discussing to add SSD for OSD journal. I'm running proxmox and I try to remove a pool which I created wrong. Remove entry of this OSD from ceph. Lowering the bar to installing Ceph The last few years have seen Ceph continue to mature in stability, scale and performance to become the leading open source storage platform. 1 Watch osd data rebalance get done #ceph -w Stop the osd #Service ceph stop osd. Adding the OSD. Of course, I forgot to remove the CEPH monitor before removing the node from the cluster. When it gets marked in again, the weight will be changed to 1. 1 $ ceph osd rm 1 $ ceph osd purge 1 –yes-i-really-mean-it Before Luminous Luminous 6. * OSD to be replaced is OSD. Ceph とは何か 4. 1 $ ceph auth del osd. ceph osd out osd. # ceph osd pool set rbd pg_num 4096 # ceph osd pool set rbd pgp_num 4096 After this it should be fine. Luminous – Remove OSDs $ ceph osd out 1 $ systemctl stop ceph-osd@1. ceph-deploy will make it and everything runs nice, expcet that for each of 3 OSDs 1 tmpfs partition is being created, which is 2gb and after copying ~50gb of data to CephFS Bluestore - box starts agressively using RAM and ends up with using all the swap. ceph osd in osd.