Hi,
I cannot get rid of
pgs unknown
because there were 3 disks that couldn't be started.
Therefore I destroyed the relevant OSD and re-created it for the
relevant disks.
Then I added the 3 OSDs to crushmap.
Regards
Thomas
Am 20.09.2019 um 08:19 schrieb Ashley Merrick:
> Your need to fix this first.
>
> pgs: 0.056% pgs unknown
> 0.553% pgs not active
>
> The back filling will cause slow I/O, but having pgs unknown and not
> active will cause I/O blocking which your seeing with the VM booting.
>
> Seems you have 4 OSD's down, if you get them back online you should be
> able to get all the PG's online.
>
>
> ---- On Fri, 20 Sep 2019 14:14:01 +0800 *Thomas <74cmonty@xxxxxxxxx>*
> wrote ----
>
> Hi,
>
> here I describe 1 of the 2 major issues I'm currently facing in my 8
> node ceph cluster (2x MDS, 6x ODS).
>
> The issue is that I cannot start any virtual machine KVM or container
> LXC; the boot process just hangs after a few seconds.
> All these KVMs and LXCs have in common that their virtual disks
> reside
> in the same pool: hdd
>
> This pool hdd is relatively small compared to the largest pool:
> hdb_backup
> root@ld3955:~# rados df
> POOL_NAME USED OBJECTS CLONES COPIES
> MISSING_ON_PRIMARY
> UNFOUND DEGRADED RD_OPS RD WR_OPS WR USED COMPR
> UNDER COMPR
> backup 0 B 0 0
> 0
> 0 0 0 0 0 B 0 0 B 0
> B 0 B
> hdb_backup 589 TiB 51262212 0
> 153786636
> 0 0 124895 12266095 4.3 TiB 247132863 463 TiB 0
> B 0 B
> hdd 3.2 TiB 281884 6568
> 845652
> 0 0 1658 275277357 16 TiB 208213922 10 TiB 0
> B 0 B
> pve_cephfs_data 955 GiB 91832 0
> 275496
> 0 0 3038 2103 1021 MiB 102170 318 GiB 0
> B 0 B
> pve_cephfs_metadata 486 MiB 62 0
> 186
> 0 0 7 860 1.4 GiB 12393 166 MiB 0
> B 0 B
>
> total_objects 51635990
> total_used 597 TiB
> total_avail 522 TiB
> total_space 1.1 PiB
>
> This is the current health status of the ceph cluster:
> cluster:
> id: 6b1b5117-6e08-4843-93d6-2da3cf8a6bae
> health: HEALTH_ERR
> 1 filesystem is degraded
> 1 MDSs report slow metadata IOs
> 1 backfillfull osd(s)
> 87 nearfull osd(s)
> 1 pool(s) backfillfull
> Reduced data availability: 54 pgs inactive, 47 pgs
> peering,
> 1 pg stale
> Degraded data redundancy: 129598/154907946 objects
> degraded
> (0.084%), 33 pgs degraded, 33 pgs undersized
> Degraded data redundancy (low space): 322 pgs
> backfill_toofull
> 1 subtrees have overcommitted pool target_size_bytes
> 1 subtrees have overcommitted pool target_size_ratio
> 1 pools have too many placement groups
> 21 slow requests are blocked > 32 sec
>
> services:
> mon: 3 daemons, quorum ld5505,ld5506,ld5507 (age 14h)
> mgr: ld5507(active, since 16h), standbys: ld5506, ld5505
> mds: pve_cephfs:1/1 {0=ld3955=up:replay} 1 up:standby
> osd: 360 osds: 356 up, 356 in; 382 remapped pgs
>
> data:
> pools: 5 pools, 8868 pgs
> objects: 51.64M objects, 197 TiB
> usage: 597 TiB used, 522 TiB / 1.1 PiB avail
> pgs: 0.056% pgs unknown
> 0.553% pgs not active
> 129598/154907946 objects degraded (0.084%)
> 2211119/154907946 objects misplaced (1.427%)
> 8458 active+clean
> 298 active+remapped+backfill_toofull
> 29 remapped+peering
> 24
> active+undersized+degraded+remapped+backfill_toofull
> 22 active+remapped+backfill_wait
> 17 peering
> 5 unknown
> 5 active+recovery_wait+undersized+degraded+remapped
> 3 active+undersized+degraded+remapped+backfill_wait
> 2 activating+remapped
> 1 active+clean+remapped
> 1 stale+peering
> 1 active+remapped+backfilling
> 1 active+recovering+undersized+remapped
> 1 active+recovery_wait+degraded
>
> io:
> client: 9.2 KiB/s wr, 0 op/s rd, 1 op/s wr
>
> I believe the cluster is busy with rebalancing pool hdb_backup.
> I set the balance mode upmap recently after the 589TB data was
> written.
> root@ld3955:~# ceph balancer status
> {
> "active": true,
> "plans": [],
> "mode": "upmap"
> }
>
>
> In order to resolve the issue with pool hdd I started some
> investigation.
> First step was to install drivers for the NIC provided Mellanox.
> Then I configured some kernel parameters recommended
> <https://community.mellanox.com/s/article/linux-sysctl-tuning> by
> Mellanox.
>
> However this didn't fix the issue.
> In my opinion I must get rid of all "slow requests are blocked".
>
> When I check the output of ceph health detail any OSD listed under
> REQUEST_SLOW points to an OSD that belongs to pool hdd.
> This means none of the disks belonging to pool hdb_backup is
> showing a
> comparable behaviour.
>
> Then I checked the running processes on the different OSD nodes; I
> use
> tool "glances" here.
> Here I can see single processes that are running for hours and
> consuming
> much CPU, e.g.
> 66.8 0.2 2.13G 1.17G 1192756 ceph 17h8:33 58 0 S
> 41M 2K
> /usr/bin/ceph-osd -f --cluster ceph --id 37 --setuser ceph
> --setgroup ceph
> 34.2 0.2 4.31G 1.20G 971267 ceph 15h38:46 58 0 S
> 14M 3K
> /usr/bin/ceph-osd -f --cluster ceph --id 73 --setuser ceph
> --setgroup ceph
>
> Similar processes are running on 4 OSD nodes.
> All processes have in common that the relevant OSD belongs to pool
> hdd.
>
> Furthermore glances gives me this alert:
> CRITICAL on CPU_IOWAIT (Min:1.9 Mean:2.3 Max:2.6): ceph-osd,
> ceph-osd,
> ceph-osd
>
> What can / should I do now?
> Kill the long running processes?
> Stop the relevant OSDs?
>
> Please advise?
>
> THX
> Thomas
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