Ceph deep scrub. Ok, so the problematic PG is 17. The interval in seconds for pool “deep” scrubbing. <fsname>:0 scrub start <path> [scrubopts] [tag] where scrubopts is a comma delimited list of recursive, force, or repair and tag is an optional custom string tag (the default is a generated UUID). Ceph ensures data integrity by scrubbing placement groups. during deep scrub ceph control the content of all replicas (one by one). A parameter to limit the number of running deep-scrub processes at any given time would be useful so as to ensure fine-grained control over this I/O intensive process. Specifying a dm-crypt requires 因此一个PG的Scrub流程每次会启动小部分的对象校验，Ceph 会以每个对象名的哈希值的部分作为提取因子，每次启动对象校验会找到符合本次哈希值的对象，然后进行比较。Scrub是Ceph集群进行的副本间的数据扫描操作，以检测副本间的数据一致性，包括Scrub和Deep-Scrub，其中Scrub只是对元数据信息进行 Setting this to false disables scheduling new scrub, and deep-scrub, while there is an active recovery. Description: Warning when you encounter an object with more OMAP key bytes than this Sets the maximum interval (in seconds) for scrubs of the pool’s PGs regardless of cluster load. To verify the integrity of data, Ceph uses a mechanism called deep scrubbing which browse all your data once per week for each placement group. 1 osd. Default. " ceph tell 'osd. Sometimes PGs can hang during a scrub/deep-scrubbing process and need manual intervention to progress. The osd scrub chunk min setting represents If you do not have access to professional support for your cluster, consult the ceph-users mailing list or the #ceph IRC/Slack channel. Verify the host is healthy, the daemon is started, and network is functioning. So you'll need to repeat remove/scrub steps for these newly detected objects again. Adjust the following To verify the integrity of data, Ceph uses a mechanism called deep scrubbing which browse all your data once per week for each placement group. 5a not sure if both are needed ? damon1 Active Member. Type: integer Default: 1 osd_scrub_begin_hour. health: HEALTH_WARN 68 pgs not scrubbed in time services: mon: 3 daemons, Ceph: Deep scrubs taking too long Ceph pgs not deep-scrubbed in time. Setting this to false disables scheduling new scrub, and deep-scrub, while there is an active recovery. About. Large values would improve scrubbing performance but may Health checks¶ Overview¶. 512 KB. 유형 false 로 설정하면 활성 복구가 있는 동안 새 scrub 및 deep-scrub 예약이 비활성화됩니다. Whilst our cluster can sustain backfills and deep scrubs during normal operation, it does affect storage I/O when deep scrubs run during production hours (7am-7pm Mondays through to Fridays). Use osd_scrub_begin_hour = 0 and Disable the shallow and deep scrubbing: [ceph: root@host01 /]# ceph osd set noscrub [ceph: root@host01 /]# ceph osd set nodeep-scrub; Use the Ceph Placement Groups (PGs) per Pool Calculator to calculate the optimal value of the pg_num and pgp_num parameters. Over time, disk sectors can go bad irrespective of object sizes and checksums. ceph -w | grep ID. osd_deep_scrub_large_omap_object_value_sum_threshold. """ At few days ago I triggered a deep scrub of all OSD on one host which came back clean and a day later that host (-02) reported multiple errors again. Run ceph -s or ceph health detail to confirm this: osd_scrub_begin_hour osd_scrub_end_hour osd_scrub_begin_week_day osd_scrub_end_week_day if we don't want ceph cluster run "scrub" and "deep scrub" at work time, how to avoid it, and is there is rec Ceph will begin flushing or evicting objects when the max_bytes threshold is triggered. Start the deep scrubbing process on the placement group. * injectargs -- --osd_max_scrubs=2 For chunky scrubs, Ceph scrubs objects one chunk at a time with writes blocked for that chunk. Double. Neha - I did upload the logs of a deep-scrub via ceph-post-file: 1e5ff0f8-9b76-4489-8529-ee5e6f246093 There is a little text file with the exact steps I took. Initiated scrub state is must_scrub &&!must_deep_scrub &&!time_for_deep. removeOSDsIfOutAndSafeToRemove: If true the operator will remove the OSDs that are down and whose data has been restored to other OSDs. This far from done "Ceph Scrub Daemon" fires off scrubs on PGs and prioritizes PGs by last(_deep)_scrub timestamp. Keep in mind "degraded" and undersized PGs, while potentially concerning in some situations, are more or less common situations a cluster encounters (anytime you reboot a Ceph的scrub类似于文件系统的 fsck，对于每个 pg，Ceph生成所有对象的列表，并比较每个对象多个副本，以确保没有对象丢失或数据不一致。 （2）Deep scrub：检查对象各个副本数据内容是否一致，耗时长，占用IO资源多；scrub CEPH Filesystem Users — Re: 6 pgs not deep-scrubbed in time Re: 6 pgs not deep-scrubbed in time the next power of 2 jump to 512 >>>> and probably beyond. In the OSDs Deep Scrub dialog box OSDs were allowed to use all cores on the nodes. Initiated scrub after osd_deep_scrub_interval state is must_scrub &&!must_deep_scrub && time_for_deep. Secondly Ceph has a deep scrub procedure where all data in the cluster is ready once a week by default and you don't want to make that much less often. The data and index pools were each given 8192 osd_max_scrubs: The maximum number of simultaneous scrub operations for a Ceph OSD daemon: osd_max_scrubs = 1. The primary gathers these scrubmaps from each replica When a scrub is performed on a PG, the OSD attempts to choose an authoritative copy from among its replicas. [INF] osd. Ceph generates a catalog of all objects in each placement group and compares each primary object to its replicas, ensuring that no objects are missing or mismatched. Default is 0. int. # ceph osd deep-scrub osd. D = Do deep scrub. Light scrubbing checks object sizes and checksums to ensure that PGs are storing the same object data. 35,osd. The next deep scrub then writes out the full checksum omap entries. Scrub can be classified into two parts: Forward Scrub: In which the scrub CephFS provides the cluster admin (operator) to check consistency of a file system via a set of scrub commands. * injectargs -- --osd_scrub_sleep=0. VERSION REPORTED UP UP_PRIMARY ACTING ACTING_PRIMARY LAST_SCRUB SCRUB_STAMP LAST_DEEP_SCRUB DEEP_SCRUB_STAMP 3. As this might involve a large number of objects (though probably not), we do not want to keep this in memory. To scrub the OSD, select the row. This might be because the cluster contains many large PGs, which take longer to deep-scrub. ceph [ceph: root@host01 /]# ceph health detail HEALTH_ERR 1 pgs inconsistent; 2 scrub errors pg 0. This means that the scrubbing takes only place at night and doesn't bother anyone in business hours. Table Of Contents. <id>, as well as optional base64 cepx key for dm-crypt lockbox access and a dm-crypt key. But the most the description for: osd_scrub_begin_week_day says "But a scrub will be performed no matter whether the time window allows or not, when the PG’s scrub interval exceeds osd_scrub_max_interval. An example command is: Mark OSDs up/down/out, purge and reweight OSDs, perform scrub operations, modify various scrub-related configuration options, select profiles to adjust the level of backfilling activity. Use the -D or --deep-scrub argument to make it run deep scrubs. No translations currently exist Usage: ceph pg debug unfound_objects_exist|degraded_pgs_exist Subcommand deep-scrub starts deep-scrub on <pgid>. Use osd_scrub_begin_week_day = 0 and osd_scrub_end_week_day = 0 to allow scrubbing for the entire week. Ceph blocks writes to a single chunk during scrub. Initiated scrub after Hi @zhucan, disabling deep scrub is something not recommended in a Ceph cluster, mostly because it's synonymous to a file system check for a local filesystem, and is needed to maintain data integrity. S = Do regular scrub. 37 ceph osd deep-scrub osd. Type: integer. osd_scrub_auto_repair. After a deep scrub, Ceph calculates the checksum of an object read from the disk and compares it to the checksum previously recorded. All gists Back to GitHub Sign in Sign up Sign in Sign up You signed in with another tab or window. Setting this to true will enable automatic PG repair when errors are found by scrubs or deep-scrubs. The basic command for deep-scrubbing is: ceph pg deep-scrub <pg-id> and you can find the placement group ID using: ceph pg dump. 94 Verification. Allowed range: [0, 6] osd_scrub_during_recovery. 5 The default is ^(active\+clean|active\+clean\+scrubbing|active\+clean\+scrubbing\+deep)$. Adjust the thresholds with ceph config set osd osd_deep_scrub_large_omap_object_key_threshold KEYS and ceph config set osd osd_deep_scrub_large_omap_object_value_sum_threshold BYTES commands. Ceph will prevent new deep scrubbing operations. The Ceph Documentation is a community resource funded and hosted by the non-profit Ceph Foundation. Usage: ceph pg dump {all|summary|sum|delta|pools|osds|pgs|pgs_brief} [{all|summary|sum|delta|pools|osds|pgs|pgs Ceph will not scrub when the system load (as defined by getloadavg() / number of online CPUs) is higher than this number. log belongs to deleted bucket listed under stale instances; Resolution. < id > dump_scrub_reservations. 集群状态是OK的，仅发现了有两个pg正在做deep-scrub（Ceph静默检查程序，主要用来检查pg中对象数据不一致，本文后续章节有详细介绍），这两个pg属于业务数据pool（对象元数据、对象数据、日志等数据是存储在不同的pool中的），另外，发现运行scrub的时间段是23:00~06:00。 因此一个PG的Scrub流程每次会启动小部分的对象校验，Ceph 会以每个对象名的哈希值的部分作为提取因子，每次启动对象校验会找到符合本次哈希值的对象，然后进行比较。Scrub是Ceph集群进行的副本间的数据扫描操作，以检测副本间的数据一致性，包括Scrub和Deep-Scrub，其中Scrub只是对元数据信息进行 deep. There is a finite set of possible health messages that a Ceph cluster can raise – these are defined as health checks which have unique identifiers. Example. Apr 18, 2019 95 9 28 57. So far I’ve discovered that this particular cluster is configured incorrectly for the number of PGS per OSD. php. It check the Recursive scrub is asynchronous (as hinted by mode in the output above). Along with osd_scrub_end_hour, you can define a time window in which the scrubs can happen. com> Copy link stale bot commented Oct 1, 2019 In addition to making multiple copies of objects, Ceph insures data integrity by scrubbing placement groups. Scrub Reservations¶ An OSD daemon command dumps total local and remote reservations: ceph daemon osd. noscrub. You can check the status of PGs with ceph pg [0], and it should also be logged when it starts deep CephFS provides the cluster admin (operator) to check consistency of a file system via a set of scrub commands. The already running scrubs continue which is useful to reduce load on busy storage clusters. You can adjust the following settings to increase or decrease scrubbing operations. 1 • How to set many options cluster-wide: ulimit -n 10000; ceph tell osd. Large values would improve scrubbing performance but may adversely affect client operations latency. recovery_wait The ceph pg dump command now prints three additional columns: LAST_SCRUB_DURATION shows the duration (in seconds) of the last completed scrub; SCRUB_SCHEDULING conveys whether a PG is scheduled to be scrubbed at a specified time, whether it is queued for scrubbing, or whether it is being scrubbed; OBJECTS_SCRUBBED shows the number of I see in the log that other PG's get (deep) scrubbed according to the automatic scheduling There is no recovery going on but just to be sure I'd set ceph daemon osd. Before doing this, it is important to know exactly why the pgs are inconsistent since there are cases that are dangerous to repair with this tool. 720340 pg xx. Alwin Proxmox Retired Staff. Ceph will prevent new rebalancing operations. Deep scrub kills your IOs ¶ The scrub is a fsck for objects. ceph 运维操作-SCRUB 1. Common causes include a stopped or crashed daemon, a down host, or a network outage. Adjust the scrubbing schedules if the scrubbing schedule takes place at inopportune times. type integer ceph pg deep-scrub <pgid> Under certain conditions, the warning PGs not deep-scrubbed in time appears. This can be the cause of overload when all osd running deep scrubbing at the same time. If it is 0, the value osd_deep_scrub_interval from config is used. If the bilog count or size is greater than the configuration parameter osd_deep_scrub_large_omap_object_key_threshold and osd_deep_scrub_large_omap_object_value_sum_threshold which defaults to 200000 (i. FIO was configured to first pre-fill RBD volume(s) with large writes, followed by 4MB and 4KB IO tests for 300 seconds each (60 seconds during debugging runs). x Red Hat Ceph Storage (RHCS) 6. HDDs are typically capable of up to maybe 200MB/s but only when you are doing sequential reads --deep deep scrub/repair (read and validate object data, not just metadata) ceph-bluestore-tool is part of Ceph, a massively scalable, open-source, distributed storage system. Adjusting scrubbing [osd] osd_scrub_begin_hour = 23 #23:01H, or 10:01PM. 97] have slow ops. It's possible to set up a deep-scrubbing schedule if there are off peak hours To get out of this situation, both scrub and deep scrub were deactivated with: root@bm0015:~# ceph osd set noscrub set noscrub root@bm0015:~# ceph osd set nodeep-scrub set nodeep Ceph will periodically deep scrub PGs. But the most If the value of scrub_max_interval is 0, then the value osd_scrub_max_interval from central config is used. The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Ceph will begin flushing or evicting objects when the max_bytes threshold is triggered. notieragent. Ceph will begin flushing or evicting objects when the max_bytes threshold is triggered. The default is every PG has to be deep-scrubbed once a week. If the value of deep_scrub_interval is 0, the value osd_deep_scrub_interval from central config is Slow backfill and slow scrub/deep-scrub under mClock I/O scheduler. In conjunction with scrubbing the scrub is a deep scrub. Displays primary and replica placement groups for the object. If the value of scrub_max_interval is 0, then the value osd_scrub_max_interval from central config is used. 67,osd. 274193 86'84 182:119 deep. 3d shard 1: soid 2:bc5082d5:::rbd_data. The frequencies of both light scrubbing and deep scrubbing are determined by the cluster’s configuration, which is fully under your control and subject to the bash $ sudo ceph health detail HEALTH_ERR 1 pgs inconsistent; 2 scrub errors pg 17. IV. b is active+clean+inconsistent, acting [6,13,15] 2 scrub errors ceph pg deep-scrub ID. Brought to you by the Ceph Foundation. You can get a list of the pg_id's from ceph pg dump. Description: The maximum number of simultaneous scrub operations for a Ceph OSD Daemon. Custom tags get persisted in the metadata object for every inode in the file system tree that is being scrubbed. 8TB read once a week is 13 megabytes per second. 6 on osd. Finally, run a forward scrub to repair recursive statistics. >>>> >>>> Keep in mind this is not going to fix your short term deep-scrub issue >>>> in fact it will increase the number of not scrubbed in time PGs until the >>>> pg_num Disable the shallow and deep scrubbing. CEPH pgs not deep-scrubbed in time I am having a major issue with ceph version 15. Recently I built ceph with two server configuration. Default: 0. - ceph_deep_scrub. 32, which don't send 'flush' When a scrub is performed on a PG, the lead OSD attempts to choose an authoritative copy from among its replicas. xxx not deep-scrubbed since 2020-10-03 08:11:54. Scrub¶ We currently have two scrub modes with different default frequencies: [shallow] scrub: compares the set of objects and metadata, but not the contents. Ceph will prevent new scrubbing operations. This goes for both erasure-coded (EC) and replicated pools. 1 什么是 Scrub Scrub是 Ceph 集群副本进行数据扫描的操作，用于检测副本间数据的一致性，包括 scrub 和 deep-scrub。 其中scrub 只对元数据信息进行扫描，相对比较快；而deep-scrub 不仅对元数据进行扫描， Then put OSD back online and initiate deep scrub for this specific PG via ceph cli again. Description. Previous Next Ceph File System Scrub Scrub tag is a random string that can used to monitor the progress of the scrub operation (explained further in this document). 0 to deep-scrub; Search the output of the ceph -w for any messages related to that placement group: Syntax ceph -w Bucket ID in the ceph. 5. Ceph Filesystem Scrub Scrub tag is a random string that can used to monitor the progress of the scrub operation (explained further in this document). For example, a deep scrub happens on Jan 1. target_max_objects. A Note PG counts ¶ # inject any ceph. The ceph tell {pg-id} deep-scrub. 107 basic Ceph/ODF: Slow backfill and slow scrub/deep-scrub under mClock I/O scheduler. osd_scrub_sleep: T he time in seconds that scrubbing sleeps between two consecutive scrubs: osd_scrub_sleep = . 10. 使用 不一致的 PG 的 ID 替换 ID，例如： [root@mon ~]# ceph pg deep-scrub 0. 1778 config set osd_scrub_during_recovery true Also the load limit is set way higher then the actual system load I checked the other osds en there are no scrubs going on on these when I schedule the Out cluster has been showing `Possible data damage: 5 pgs inconsistent` for about a week now. PGs are normally scrubbed every osd_deep_scrub_interval seconds, and this warning triggers when mon_warn_not The minimal number of object store chunks to scrub during single operation. State variables¶. If a running scrub interferes with business (performance) needs, you can adjust the time when scrubs Ceph PGs not deep scrubbed in time keep increasing. 2. The minimal number of object store chunks to scrub during a single operation. osd_scrub_chunk_min: The minimum number of data chunks an OSD should perform scrubbing on: osd_scrub_chunk_min = 1 集群状态是OK的，仅发现了有两个pg正在做deep-scrub（Ceph静默检查程序，主要用来检查pg中对象数据不一致，本文后续章节有详细介绍），这两个pg属于业务数据pool（对象元数据、对象数据、日志等数据是存储在不同的pool中的），另外，发现运行scrub的时间段 Now that we’ve identified which OSDs are hosting the large omap objects, we need to run a deep scrub on them. 1c1 and check if this will fix your issue. 1 --osd_max_scrubs=1 • Not all options can be set at run-time. Usage: ceph pg deep-scrub <pgid> Subcommand dump shows human-readable versions of pg map (only 'all' valid with plain). Supported Browsers¶ Ceph Dashboard is primarily tested and developed using the following web browsers: Browser [ceph: root@host01 /]# ceph pg deep-scrub 0. A cache tier pool is nearly full. 1c1 and is acting on OSD 21, 25 and 30. Basically loop over all the active PGs, instructing each to deep-scrub: ceph pg dump | grep -i active | cut -f 1 | while read i; do ceph pg deep-scrub ${i}; done The repair article explains how this line of script This script controls Ceph deep scrubs, making sure that each OSD is busy with a deep scrub. Ceph checks the primary and replica OSDs and generates a catalog of all objects in the PG. Periodic tick after osd_deep_scrub_interval state is!must_scrub &&!must_deep_scrub && time_for_deep. ceph Actions: Copied to RADOS - Backport #40653: luminous: Lower the default value of osd_deep_scrub_large_omap_object_key_threshold Resolved: Neha Ojha: Actions: Copied to RADOS - Backport #40654: mimic: Lower the default value of osd_deep_scrub_large_omap_object_key_threshold Resolved: Neha Ojha: Actions: I recall a discussion on the Ceph mailing list about this, however I can't find any pointers. Light scrubbing checks the object size and attributes, and is usually done daily. norecover. However, if more than osd_scrub_auto_repair_num_errors errors are found a repair is NOT The value of “osd_deep_scrub_large_omap_object_key_threshold” determines when Ceph will consider an object to have a “large” amount of “omap” keys. Initiated scrub after If you want to force the pages to deep scrub use "ceph health detail" to find the pages then ceph pg deep-scrub 1. After 5 month in production i have done the upgrade last weekend and now i'm stuck with errors on ceph pg's! HEALTH_ERR 8 pgs inconsistent; 42 scrub errors pg 11. 786742 NOTE: For scrubs/deep-scrubs that are stuck scrubbing the same PG Start the deep scrubbing process on the placement group: ceph pg deep-scrub <id> Replace <id> with the ID of the inconsistent placement group, for example: # ceph pg deep-scrub 0. If the cron fails, deep-scrubbing will still happen once a month. Runs shallow scrubs by default. com for more information. If you would like to support [root@mon ~]# ceph pg deep-scrub ID. Description: Allow scrub during recovery. 1:6804/1962722 5 : cluster [ERR] 2. However I am sure it's part of the Ceph developers TODO :). I’ve just started looking into one of our ceph clusters because a weekly deep scrub had a major IO impact on the cluster which caused multiple VMs to grind to a halt. 1. osd_scrub_chunk_max. After performing a deep scrub, Ceph calculates the checksum of an object that is read from disk and compares it to the checksum that was previously recorded. From Edit drop-down menu, select Scrub. (and of course your cluster will be marked as HEALTH_WARN). This particularly affects legacy Linux VMs running kernels prior to 2. Take an Usually the cluster deep-scrubs itself during low I/O intervals on the cluster. Ceph checks every object in a PG for its health. ceph osd deep-scrub osd. However, you can also The "queued for deep scrub" bit is simply the fact that ceph will not allow scrubbing operations on OSDs currently performing recovery. see also. For each placement group, Ceph generates a catalog of all objects and compares each primary object and its replicas to ensure that no objects are missing or mismatched. Which might kill some OSDs again at different broken object(s) if any though. The By default, Ceph performs light scrubbing daily and deep scrubbing weekly. Aug 1, 2017 # /usr/bin/ceph --id=storage --connect-timeout=5 health detail HEALTH_ERR 1 scrub errors; Possible data damage: 1 pg inconsistent OSD_SCRUB_ERRORS 1 scrub errors PG_DAMAGED Possible data damage: 1 pg inconsistent pg 5. Integer. *' injectargs -- --debug_ms=0 # This can be done on modern clusters with ceph config set # ceph central configs ceph config Recursive scrub is asynchronous (as hinted by mode in the output above). ceph pg deep-scrub ID. The current default value for this is 200000. 병렬로 수행되는 최대 scrub 작업 수입니다. Among all of the possible cases, only one case is consistent. Default 0. After a day, as the IO load remained stable confirming that no other factor was causing it, scrubbing was re-activated. 27a274b0dc51. ceph config set mds_max_scrub_ops_in_progress VALUE 명령을 사용하여 이 값을 설정할 수 있습니다. In the OSDs Scrub dialog box, click Update. The osd scrub chunk min setting represents the minimum number of chunks to scrub. Upon enabling the "No Deep Scrub" flag and initiating data rebalancing, we're facing frequent OSD downtimes. 55b is active+clean+inconsistent, acting ceph osd进程中，由周期性timer线程检查pg是否需要做scrub，另外，也可以通过命令行(ceph pg scrub pgid)触发scrub， 实现的时候主要是设置一个must_scrub标志位完成，不难看出，scrub的粒度是以pg为单位进行的。 同时，deep_scrub可能也应该关闭，避免造成大的IO请求。 Ceph was deployed and fio tests were launched using CBT. Custom tag can also be specified when initiating the scrub operation. The new OSD will have the specified uuid, and the command expects a JSON file containing the base64 cephx key for auth entity client. Deep scrubbing (weekly) reads the data and uses checksums to ensure data integrity. 259033 osd. Red Hat Ceph Storage (RHCS) 5. 32. Sets the maximum interval (in seconds) for scrubs of the pool’s PGs regardless of cluster load. If you're doing that in a script, you might prefer ceph pg dump --format=json. ceph pg deep-scrub ID Replace ID with the ID of the inconsistent placement group. 0 to deep-scrub; Search the output of the ceph -w for any messages related to that placement group: Initiated scrub after osd_deep_scrub_interval state is must_scrub &&!must_deep_scrub && time_for_deep. Type: Float. Dec 10, 2019 #7 deep-scrub does the jop . Start the deep scrubbing process on the placement group: Syntax ceph pg deep-scrub ID. It tries to limit the number of simultaneous scrubs, but this logic may well be flawed. Adjust the following For chunky scrubs, Ceph scrubs objects one chunk at a time with writes blocked for that chunk. 0000000000022200:head data_digest 0x9040bfa6 != X = Do nothing. Large values would improve scrubbing performance but may adversely affect client operations’ latency. 524288. 13, The PGS keep falling behind scrubbing. Scrub and deep scrub configuration must also be applied to MGR, otherwise, it uses old defaults and as time passes, warnings are issued for missing scrubs. When a scrub is performed on a placement group, the OSD attempts to choose an authoritative copy from among its replicas. 1000000000000 #1-TB. after a while it starts reporting '6 large omap objects'. The unintuitive workaround is: ceph osd set nodeep-scrub ceph osd set noscrub ceph tell osd. Detailed Description¶ On the osd side, the first change is that the primary needs to track the inconsistency information as scrub progresses. ceph. ceph_osdmap_flag_nodeep_scrub: 禁用Deep scrubbing # HELP ceph_osdmap_flag_nodeep_scrub Deep scrubbing is disabled: ceph_osdmap_flag_nodown: 忽略OSD失败报告，OSD不会被标记为down # HELP ceph_osdmap_flag_nodown OSD failure reports are ignored, OSDs will not be marked as down: ceph_osdmap_flag_noin: 不会自动标 ceph health detail shows pgs not deep-scrubbed in time ceph health detail PG_NOT_DEEP_SCRUBBED 104 pgs not deep-scrubbed in time pg xx. Calculate the optimal value of the pg_num and pgp_num parameters. Locate an object from a pool. Once the scrub completes on the OSDs, the cluster should be in a healthy state again. 基本概念 1. You get a notification that the scrubbing of the OSD was initiated successfully. The pg dump contains last_scrub, scrub_stamp, last_deep_scrub, and deep An added status in Ceph health that your PGs are unable to keep up with the current scrub/deep-scrub schedule would be helpful in diagnosing and preventing a problem where you can't issue repairs, deep-scrubs, or scrubs. Currently that setting is 6 but should be closer to ~4096 based on Ceph (deep) scrub daemon. ceph-fuse mount failed because no mds (issue#22205, pr#22895, liyan) ceph-volume add a __release__ string, to help version-conditional calls (issue#25170, pr#23331, Alfredo Deza) On clusters with quite full PGs, it is common (i. You can always try to run ceph pg repair 17. Please refer to the Ceph documentation at https://docs. Sets the interval (in seconds) for pool “deep” scrubs of the pool’s PGs. The Red Hat Ceph Storage Dashboard is the most common way to conduct high-level monitoring. As a storage administrator, you can monitor the health of the Ceph daemons to ensure that they are up and running. 集群状态是OK的，仅发现了有两个pg正在做deep-scrub（Ceph静默检查程序，主要用来检查pg中对象数据不一致，本文后续章节有详细介绍），这两个pg属于业务数据pool（对象元数据、对象数据、日志等数据是存储在不同的pool中的），另外，发现运行scrub的时间段是23:00~06:00。 ceph pg dump. CACHE_POOL_NEAR_FULL: A cache tier pool is nearly full. Custom tags get persisted in the metadata object for every inode in the filesystem tree that is being scrubbed. Environment. Scrub是 Ceph 集群副本进行数据扫描的操作，用于检测副本间数据的一致性，包括 scrub 和 deep-scrub。 其中scrub 只对元数据信息进行扫描，相对比较快；而deep-scrub 不仅对元数据进行扫描，还会对存储的数据进行扫描，相对比较慢。 osd_scrub_begin_hour osd_scrub_end_hour osd_scrub_begin_week_day osd_scrub_end_week_day if we don't want ceph cluster run "scrub" and "deep scrub" at work time, how to avoid it, and is there is rec Due to the more intensive nature of a deep-scrub, overlapping or multiple running deep-scrubs tends to cause resource contention in some cluster configurations. Replace ID with the ID of the inconsistent placement group, for example: [ceph: root@host01 /]# ceph pg deep-scrub 0. 0 to deep-scrub; 搜索 ceph -w 的输出，以查找与该放置组相关的任何消息： ceph -w | grep ID. Scrubbing on its own is where Ceph checks that the objects and relevant metadata In this post I’ll explain why I had a such situation on the CEPH infrastructure and what are the settings to modify this I/O level. 0 to deep-scrub; Search the output of the ceph -w for any messages related to that placement group: ceph -w | grep <id> Ceph ensures data integrity by scrubbing placement groups. 0000000000022200:head data_digest 0x9040bfa6 != Ceph File System Scrub Scrub tag is a random string that can used to monitor the progress of the scrub operation (explained further in this document). Replace ID with the ID of the inconsistent placement group, for example: Health checks¶ Overview¶. If you would like to support this and our other efforts, please consider joining now. Asynchronous scrubs must be polled using scrub status to determine the status. it only has one bucket with many objects in it. To deep-scrub the OSD, select the row. 0 to deep-scrub; Search the output of the ceph -w for any messages related to that placement group: Syntax. osd. 3X replication was used across all RGW pools. Description: Warning when you encounter an object with more OMAP key bytes than this. deep scrub/repair (read and validate object data, not just metadata) Device labels ¶ Every BlueStore block device has a single block label at the beginning of the device. Certain background processes, such as scrub, deep scrub, pg autoscaling, and pg balancing were disabled. 6. ceph osd set noscrub ceph osd set nodeep-scrub. Reload to refresh your session. 5a etc you can also do ceph pg scrub 1. And if you want to instruct all placement groups to deep-scrub, use the same script from repairing inconsistent PGs. 1c1 is active+clean+inconsistent, acting [21,25,30] 2 scrub errors. 0 24 0 0 0 0 100663296 84 84 active+clean 2018-09-24 10:00:31. OSD takes suicide timeout during deep_scrub on pg after upgrade to Hammer 94. Scrub can be classified into two parts: Forward Scrub: In which the scrub X = Do nothing. Deep-scrubbing the OSDs. The replica fills out this scrubmap for the range of objects including, if the scrub is deep, a CRC32 of the contents of each object. backfill_toofull. cleanupPolicy: cleanup policy settings osd_max_scrubs. 8 improves the deep scrub code to automatically repair these inconsistencies. deep_scrub_interval Description. About a week ago we started getting a warning that pgs weren't being deep scrubbed in time. If the value of deep_scrub_interval is 0, the value osd_deep_scrub_interval from central config is Ceph will not scrub when the system load (as defined by getloadavg() / number of online CPUs) is higher than this number. The minimal interval in seconds for scrubbing the Ceph OSD Daemon when the Ceph Storage Whilst our cluster can sustain backfills and deep scrubs during normal operation, it does affect storage I/O when deep scrubs run during production hours (7am-7pm Mondays through to Fridays). Ceph will not scrub when the system load (as defined by the getloadavg() function) is higher than this number. 5. Ensure you have an MDS running and issue: ceph tell mds. (Some only take effect after a reboot). 0 injectargs -- --osd_scrub_sleep=0. The X = Do nothing. . Prefill the scrub pool with 100000 objects of 4 MiB size; Initiate deep scrub on the scrub pool and enable recovery and backfill at the same time; Initiate I/O on the client pool for 9 minutes using fio; While the client I/O and ceph tell {pg-id} deep-scrub. This results in higher OSD latency and the generation of slow ops send logs like"" For instance, a health check update reports: "6 slow ops, oldest one blocked for 43 sec, daemons [osd. like a variable name) string. backfill reservation rejected, OSD too full. backfilling. Read size when doing a deep scrub. Replace ID with the ID of the inconsistent placement group, for example: [root@mon ~]# ceph pg deep-scrub 0. 1 pg 2. Intro to Ceph; Installation (ceph-deploy) Installation (Manual) Installation We operate a Ceph cluster running the Octopus version (latest 15. 0 osd. i have a ceph cluster that is exclusively serving radosgw/s3. How can it be controlled? Since object scrub is an essential part of the well-being of An OSD daemon command dumps total local and remote reservations: Light scrubbing checks the object size and attributes, and is usually done daily. For each object, Ceph compares all instances of the object (in the primary and replica OSDs) to ensure that they ceph osd进程中，由周期性timer线程检查pg是否需要做scrub，另外，也可以通过命令行(ceph pg scrub pgid)触发scrub， 实现的时候主要是设置一个must_scrub标志位完成，不难看出，scrub的粒度是以pg为单位进行的。 同时，deep_scrub可能也应该关闭，避免造成大的IO请求。 图 1 Ceph 健康状态. 0 to deep-scrub; 搜索 ceph -w 的输出，以查找与该放置组相关的任何消息： 语法. Not really solving the issue, but that helped me a lot: [osd] osd_scrub_begin_hour = 0 osd_scrub_end_hour = 8. When a scrub is performed on a PG, the OSD attempts to choose an authoritative copy from among its replicas. 0. This is nothing to worry about. Should be used to handle inconsistent PGs, yet the IBM docs suggest that we should be running: . default. 1 ceph tell osd. As mentioned by @jerryjedi you can tune the scrubbing behavior, but it really depends on the To get out of this situation, both scrub and deep scrub were deactivated with: root@bm0015:~# ceph osd set noscrub set noscrub root@bm0015:~# ceph osd set nodeep-scrub set nodeep-scrub. deep_scrub_interval. 图 1 Ceph 健康状态. osd_scrub_chunk_max The maximum number of objects to deep-scrub during single internal scrub operation. The already running ceph osd [ blacklist | blocked-by | create | deep-scrub | df | down | dump | erasure-code-profile | find | getcrushmap | getmap | getmaxosd | in | lspools | map 基本概念1、什么是 ScrubScrub是 Ceph 集群副本进行数据扫描的操作，用于检测副本间数据的一致性，包括 scrub 和 deep-scrub。其中scrub 只对 Currently, consistency for all ceph pool types is ensured by primary log-based replication. e If the value of scrub_max_interval is 0, then the value osd_scrub_max_interval from central config is used. 32-bit Integer. Strangely the Ceph docs indicate that: . CEPH is using two type of scrubbing processing Customer needs to schedule deep-scrubbing for off peak hours to help minimize impact on cluster. Today I found some errors in my ceph cluster: $ ceph health detail HEALTH_ERR 1 pgs inconsistent; 2 scrub errors pg 4. You can easly see if a deep scrub is current running (and how many) with ceph status `ceph -w`. The following are the Ceph scrubbing options that you can adjust to increase or decrease scrubbing operations. " does ceph status show pgs not scrubbed in time? If so this week day setting will be ignored Subcommand new can be used to create a new OSD or to recreate a previously destroyed OSD with a specific id. ceph status or ceph -s reports inconsistent placement groups (PGs); Resolution ⓘ Ceph offers the ability to repair inconsistent PGs with the ceph pg repair command. You can Instruct Ceph to perform a deep scrubbing process (consistency check) on an OSD. The already running Adjust the thresholds with ceph config set osd osd_deep_scrub_large_omap_object_key_threshold KEYS and ceph config set osd osd_deep_scrub_large_omap_object_value_sum_threshold BYTES commands. 6 is active+clean+inconsistent, acting [0,1,2] 2 scrub errors; Determine why the placement group is inconsistent. 使用 inconsistent 的 PG 的 ID 替换 ID，例如： [ceph: root@host01 /]# ceph pg deep-scrub 0. The Deep scrubbing (weekly) reads the data and uses checksums to ensure data integrity. The longest wait for a deep scrub is osd_scrub_max_interval + osd_deep_scrub_interval between deep scrubs. Ceph blocks writes to single chunk during scrub. Ceph will disable the process that is looking for cold/dirty objects to flush and evict. Type:Integer. Only one of the possible cases is consistent. This tuneable can also be changed, but I dont suggest it here. 17). This can be the cause of Deep scrubs on a Red Hat Ceph Storage cluster can sometimes have a negative impact on the client I/O. type. a special case of recovery, in which the entire contents of the PG are scanned and synchronized, instead of inferring what needs to be transferred from the PG logs of recent operations. ceph ceph cluster deep-scrub pgs storage Replies: 4; Forum: Proxmox VE: Installation and configuration; Tags. ceph osd deep-scrub <id> Instruct Ceph to perform a deep scrubbing process (consistency check) on an OSD. 32, which don't send 'flush' By default, Ceph performs light scrubbing daily and deep scrubbing weekly. recovery_wait Deep scrubbing (weekly) reads the data and uses checksums to ensure data integrity. Option("osd_deep_scrub_large_omap_object_key_threshold", Option::TYPE_UINT, Option::LEVEL_ADVANCED) ceph config set osd osd_deep_scrub_interval 31536000 ceph config set osd osd_scrub_max_interval 31536000 据观察发现虽然设置最大超时时间为1年，但是还是会出现告警，需要调整下面配置 To start a scrub operation for a directory tree use the following command: ceph tell mds. One or more OSDs are marked down. Adjust the thresholds with the ceph config set osd osd_deep_scrub_large_omap_object_key_threshold KEYS and ceph config set osd osd_deep_scrub_large_omap_object_value_sum_threshold BYTES commands. From Edit drop-down menu, select Deep scrub. ~100% sure) that a `ceph pg repair <pgid>` does not start immediately, because the relevant osds have their osd_max_scrubs (default 1) already reserved by deep scrubs. Type. Description: The specific hour at which the scrubbing begins. *' injectargs -- --debug_ms=0 --osd_deep_scrub_interval=5356800 ceph tell 'mon. 3d Deep scrub errors, upgrading scrub to deep-scrub 2018-11-19 09:05:14. Some PGS take a long time to scrub, those PGS usually have a high number of snap_trimq"snap_trimq_len": 10859,We have an automated script that does RBD snapshots everynight. To remedy this situation, you must change the value of osd_deep_scrub_interval for OSDs and for the Manager daemon. 113. Skip to content. e. nodeep-scrub. Ceph scrubbing is analogous to fsck on the object storage layer. 0 to deep-scrub; Search the output of the ceph -w for any messages related to that placement group: Syntax ceph -w Due to the more intensive nature of a deep-scrub, overlapping or multiple running deep-scrubs tends to cause resource contention in some cluster configurations. Scrubbing is important for maintaining data integrity, but it can reduce performance. If the value of deep_scrub_interval is 0, the value osd_deep_scrub_interval from central config is Scrub / Deep-scrub analysis - Ceph의 데이터 정합성을 체크하기 위한 scrub, deep-scrub 집중적으로 분석 - 대부분 scrub / deep-scrub 은 default 로 사용 가능하지만, 대용량과 파일 수가 많은 경우 수행 지연으로 인해 정상적인 운영이 어려운 경우 분석 ceph config set osd osd_deep_scrub_large_omap_object_key_threshold <keys> ceph config set osd osd_deep_scrub_large_omap_object_value_sum_threshold <bytes> CACHE_POOL_NEAR_FULL ¶ A cache-tier pool is nearly full, as determined by the target_max_bytes and target_max_objects properties of the cache pool. There are two forms of Scrubbing, daily cheap metadata checks and weekly deep data checks. 12. Certain background processes, such as scrub, deep scrub, PG autoscaling, and PG balancing were disabled. xxx not deep-scrubbed since 2020-10-04 16:52:29. 6f1 is active+clean+scrubbing+deep+inconsistent, acting [7,141,208,199,70,37,182,131,120,259] To Ceph scrubbing is analogous to fsck on the object storage layer. 56d is active+clean+inconsistent, acting [25,0,22] pg 11. 6 instructing pg 0. 0 instructed to deep-scrub ceph osd find <id> Display location of a given OSD (host name, port, and CRUSH details) # ceph osd find 0 { 描述 清理开始的特定小时。和 osd_scrub_end_hour 一起，您可以定义一个可发生清理的时间窗。 使用 osd_scrub_begin_hour = 0 和 osd_scrub_end_hour = 0 以允许清理整个一天。 类型 整数 默认 0 允许的范围 [0, 23] 一个或多个池包含由 osd_deep_scrub_large_omap_object_key_threshold 或 osd_deep_scrub_large_omap_object_value_sum_threshold 决定的大型 omap 对象。使用 ceph config set osd_deep_scrub_large_omap_object_key_threshold KEYS 和 ceph config set osd osd_deep_scrub_large_omap_object_value_sum_threshold BYTES _threshold 命令调整 [root@rook-ceph-tools-68958dbb7f-klmcn /]# ceph health detail HEALTH_ERR 1 scrub errors; Possible data damage: 1 pg inconsistent [ERR] OSD_SCRUB_ERRORS: 1 scrub errors [ERR] PG_DAMAGED: Possible data damage: 1 pg inconsistent pg 1. If you would like to support ceph osd [ blacklist | blocked-by | create | deep-scrub | df | down | dump | erasure-code-profile | find | getcrushmap | getmap | getmaxosd | in | lspools | map Ceph scrubbing is analogous to fsck on the object storage layer. The maximum number of objects to deep-scrub during single internal scrub operation. Retired Staff. Ceph will prevent new recovery operations. x ceph pg deep-scrub <pgid> Under certain conditions, the warning PGs not deep-scrubbed in time appears. The ceph-osd daemon may have been stopped, or peer OSDs may be unable to reach the OSD over the network. Type: 32-bit Integer. Red Hat Ceph Storage (RHCS) Issue. In Ceph terms, the OSDs are out and safe-to-destroy when they are removed. For shallow scrubs (initiated by the first command format), only object metadata is compared. If OSDs go down they can't be Scrubbing means that Ceph checks the consistency of your data and is a normal background process. The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Environment. This results in higher OSD latency and the generation of slow ops send logs like"" For instance, a health check update reports: "6 slow ops, oldest one blocked This script controls Ceph deep scrubs, making sure that each OSD is busy with a deep scrub. 50 is active+clean+scrubbing+deep+inconsistent+repair, acting [5,17,2] [root@rook-ceph-tools OSD_DOWN. State variables . On my SAS drives, I see If impacting ceph performance is not a concern, the following could be done: Configure *osd max scrubs* and *osd scrub load threshold* to do more scrubbing work, but Ceph ensures data integrity by scrubbing placement groups. Use the Ceph Placement Groups bash $ sudo ceph health detail HEALTH_ERR 1 pgs inconsistent; 2 scrub errors pg 17. ceph pg repair ID. For example, [ceph: root@host01 /]# ceph osd set noscrub [ceph: root@host01 /]# ceph osd set nodeep-scrub. Each node was configured to host 6 OSDs and had 2 colocated RGW daemons. 使用 不一致的 PG 的 ID 替换 ID，例如： ceph ceph cluster deep-scrub pgs storage Replies: 4; Forum: Proxmox VE: Installation and configuration; Tags. After performing a deep scrub, Ceph calculates the checksum of each object that is read from disk and compares it to the checksum that was previously recorded. deep scrub: compares the set of objects, metadata, and a crc32 of the object contents (including omap) The primary requests a scrubmap from each replica for a particular range of objects. cephfs_recovery: 0 scrub start / recursive, repair, force. For each object, Ceph compares all instances of the object (in the primary and replica OSDs) to ensure that they are consistent. CACHE_POOL_NEAR_FULL. 1) Don't set "rebalance" flag during upgrade 2) Set "nodeep-scrub" flag during upgrade Fixes: ceph#4330 Signed-off-by: Rachana Patel <racpatel@redhat. High level monitoring also involves checking the storage cluster capacity to ensure that the storage cluster does not exceed its full ratio. You can Then there's deep scrubbing, which is designed to catch bit-rot (aka, the correctness of the PG's), it's naturally a data intensive operation. Solution Verified - Updated 2024-10-26T22:44:58+00:00 - English . Deep scrubbing reads the data and uses checksums to ensure data integrity, and is usually done weekly. The weekly deep scrub reads the objects and uses checksums to ensure data integrity. 使用docker部署了ceph，发现Reads 100% 命令查询 [root@nceph ~]# docker exec -it mon ceph health detail HEALTH_WARN 146 pgs not deep-scrubbed in time; 146 pgs not scrubbed in time; 10 pool(s) have no replicas configured [WRN] PG_NOT_DEEP_SCRUBBED: 146 pgs not deep-scrubbed in time pg 10. The identifier is a terse pseudo-human-readable (i. My OSD scrubbing configuration was: ceph config set osd osd_deep_scrub_interval 15552000 ceph config set osd osd_scrub_max_interval 8035200 ceph config set osd ceph pg deep-scrub <pgid> Under certain conditions, the warning PGs not deep-scrubbed in time appears. Basically loop over all the active PGs, instructing each to deep-scrub: ceph pg dump | grep -i Start the deep scrubbing process on the placement group: [root@mon ~]# ceph pg deep-scrub ID. ceph daemon osd. Extraordinary low QoS (throttle) values for certain OSDs WHO MASK LEVEL OPTION VALUE osd. 29 ceph osd deep-scrub osd. Deep-scrubbing manually is relatively easy, run ceph pg deep-scrub <pg_id>. The following are the Ceph scrubbing options that can be adjusted to increase or decrease scrubbing operations. 1 10. 이미 실행 중인 scrubs는 계속해서 사용 I'm seeing what at least looks similar to this bug on a cluster running: ceph version 16. Initiated scrub after osd_deep_scrub_stride. . Previous Next Initiated scrub after osd_deep_scrub_interval state is must scrub && !must_deep_scrub && time_for_deep. Previous Next When a scrub is performed on a PG, the lead OSD attempts to choose an authoritative copy from among its replicas. This was lowered from 2000000 and backported to There are scrub and repair mechanisms, this blueprint aims to expand and improve them. Periodic tick state is !must_scrub &&!must_deep_scrub &&!time_for_deep. osd_scrub_end_hour = 6 #06:01H or 6:01AM. 5 not deep So with osd_scrub_max_interval set to 1 week and a high load the next possible scrub or deep-scrub is 1 week from the last REGULAR scrub, even if the last deep scrub was more than 7 days ago. Displays light and deep scrub status. The scrub tag is used to differentiate scrubs and also to mark each inode’s first data object in the default data pool (where the backtrace information is stored) with a scrub_tag extended attribute with the value of the tag. Deep scrubs (initiated by the second command format) compare the contents of the objects as well. 0 config set osd_scrub_sleep 0. config option into running daemons # can also be done with dashboard under "Cluster" -> "Configuration Doc. uuenbbe tkmn gfysmi ufosw zjlv sph jnrwbgr dxbdwge abauuwo fcintkgi