There's a lengthy thread [0] where several approaches are proposed.
The worst is a OSD recreation, but that's the last resort, of course.
What's are the current values for these configs?
ceph config get osd osd_pg_max_concurrent_snap_trims
ceph config get osd osd_max_trimming_pgs
Maybe decrease them to 1 each while the nosnaptrim flag is set, then
unset it. You could also try online (and/or offline osd compaction)
before unsetting the flag. Are the OSD processes utilizing an entire
CPU?
[0] https://www.spinics.net/lists/ceph-users/msg75626.html
Zitat von Giovanna Ratini <giovanna.ratini@xxxxxxxxxxxxxxx>:
Hallo Eugen,
yes, the load is for now not too much.
I stop the snap and now this is the output. No changes in the queue.
root@kube-master02:~# k ceph -s
Info: running 'ceph' command with args: [-s]
cluster:
id: 3a35629a-6129-4daf-9db6-36e0eda637c7
health: HEALTH_WARN
nosnaptrim flag(s) set
32 pgs not deep-scrubbed in time
32 pgs not scrubbed in time
services:
mon: 3 daemons, quorum bx,bz,ca (age 30h)
mgr: a(active, since 29h), standbys: b
mds: 1/1 daemons up, 1 hot standby
osd: 6 osds: 6 up (since 21h), 6 in (since 6d)
flags nosnaptrim
data:
volumes: 1/1 healthy
pools: 4 pools, 97 pgs
objects: 4.21M objects, 2.5 TiB
usage: 7.7 TiB used, 76 TiB / 84 TiB avail
pgs: 65 active+clean
32 active+clean+snaptrim_wait
io:
client: 7.4 MiB/s rd, 7.9 MiB/s wr, 11 op/s rd, 35 op/s wr
Am 19.08.2024 um 14:54 schrieb Eugen Block:
What happens when you disable snaptrimming entirely?
ceph osd set nosnaptrim
So the load on your cluster seems low, but are the OSDs heavily
utilized? Have you checked iostat?
Zitat von Giovanna Ratini <giovanna.ratini@xxxxxxxxxxxxxxx>:
Hello Eugen,
*root@kube-master02:~# k ceph -s*
Info: running 'ceph' command with args: [-s]
cluster:
id: 3a35629a-6129-4daf-9db6-36e0eda637c7
health: HEALTH_WARN
32 pgs not deep-scrubbed in time
32 pgs not scrubbed in time
services:
mon: 3 daemons, quorum bx,bz,ca (age 13h)
mgr: a(active, since 13h), standbys: b
mds: 1/1 daemons up, 1 hot standby
osd: 6 osds: 6 up (since 5h), 6 in (since 5d)
data:
volumes: 1/1 healthy
pools: 4 pools, 97 pgs
objects: 4.20M objects, 2.5 TiB
usage: 7.7 TiB used, 76 TiB / 84 TiB avail
pgs: 65 active+clean
20 active+clean+snaptrim_wait
12 active+clean+snaptrim
io:
client: 3.5 MiB/s rd, 3.6 MiB/s wr, 6 op/s rd, 12 op/s wr
If I understand the documentation correctly, I will never have a
scrub unless the PGs (Placement Groups) are active and clean.
All 32 PGs of the CephFS pool have been in this status for several days:
* 20 active+clean+snaptrim_wait
* 12 active+clean+snaptrim"
Today, I restarted the MON, MGR, and MDS, but no changes in the growing.
Am 18.08.2024 um 18:39 schrieb Eugen Block:
Can you share the current ceph status? Are the OSDs reporting
anything suspicious? How is the disk utilization?
Zitat von Giovanna Ratini <giovanna.ratini@xxxxxxxxxxxxxxx>:
More information:
The snaptrim take a lot of time but the he objects_trimmed are "0"
"objects_trimmed": 0,
"snaptrim_duration": 500.58076017500002,
It could explain, why the queue are growing up..
Am 17.08.2024 um 14:37 schrieb Giovanna Ratini:
Hello again,
I checked the pgs dump. Snapshot grow up
Query für PG: 3.12
{
"snap_trimq":
"[5b974~3b,5cc3a~1,5cc3c~1,5cc3e~1,5cc40~1,5cd83~1,5cd85~1,5cd87~1,5cd89~1,5cecc~1,5cece~4,5ced3~2,5cf72~1,5cf74~4,5cf79~a2,5d0b8~1,5d0bb~1,5d0bd~a5,5d1f9~2,5d204~a5,5d349~a7,5d48e~3,5d493~a4,5d5d7~a7,5d71e~a3,5d7c2~3,5d860~1,5d865~4,5d86a~a2,5d9aa~1,5d9ac~1,5d9ae~a5,5daf3~a5,5db9a~2,5dc3a~a5,5dce1~1,5dce3~1,5dd81~a7,5dec8~a7,5e00f~a7,5e156~a8,5e29d~1,5e29f~a7,5e3e6~a8,5e52e~a6,5e5d6~2,5e676~a6,5e71e~2,5e7be~a9,5e907~a5,5e9ad~3,5ea50~a7,5eaf9~1,5eafb~1,5eb99~a7,5ec42~2,5ece2~a7,5ed8a~2,5ee2b~a9,5ef74~a7,5f01c~1,5f0bd~a1,5f15f~1,5f161~1,5f163~1,5f167~1,5f206~a1,5f2a8~1,5f2aa~1,5f2ac~1,5f2ae~1,5f34f~a1,5f3f1~1,5f3f3~1,5f3f5~1,5f3f7~1,5f499~a1,5f53b~1,5f53d~1,5f53f~1,5f541~1,5f5e3~a1,5f685~1,5f687~1,5f689~1,5f68d~1,5f72d~a1,5f7cf~1,5f7d1~1,5f7d3~1]",
* "snap_trimq_len": 5421,*
"state": "active+clean+snaptrim",
"epoch": 734130,
Query für PG: 3.12
{
"snap_trimq":
"[5b976~39,5ba53~1,5ba56~a0,5cc3a~1,5cc3c~1,5cc3e~1,5cc40~1,5cd83~1,5cd85~1,5cd87~1,5cd89~1,5cecc~1,5cece~4,5ced3~2,5cf72~1,5cf74~4,5cf79~a2,5d0b8~1,5d0bb~1,5d0bd~a5,5d1f9~2,5d204~a5,5d349~a7,5d48e~3,5d493~a4,5d5d7~a7,5d71e~a3,5d7c2~3,5d860~1,5d865~4,5d86a~a2,5d9aa~1,5d9ac~1,5d9ae~a5,5daf3~a5,5db9a~2,5dc3a~a5,5dce1~1,5dce3~1,5dd81~a7,5dec8~a7,5e00f~a7,5e156~a8,5e29d~1,5e29f~a7,5e3e6~a8,5e52e~a6,5e5d6~2,5e676~a6,5e71e~2,5e7be~a9,5e907~a5,5e9ad~3,5ea50~a7,5eaf9~1,5eafb~1,5eb99~a7,5ec42~2,5ece2~a7,5ed8a~2,5ee2b~a9,5ef74~a7,5f01c~1,5f0bd~a1,5f15f~1,5f161~1,5f163~1,5f167~1,5f206~a1,5f2a8~1,5f2aa~1,5f2ac~1,5f2ae~1,5f34f~a1,5f3f1~1,5f3f3~1,5f3f5~1,5f3f7~1,5f499~a1,5f53b~1,5f53d~1,5f53f~1,5f541~1,5f5e3~a1,5f685~1,5f687~1,5f689~1,5f68d~1,5f72d~a1,5f7cf~1,5f7d1~1,5f7d3~1,5f875~a1]",
* "snap_trimq_len": 5741,*
"state": "active+clean+snaptrim",
"epoch": 734240,
"up": [
Do you know the way to see if the snaptim "process" works?
Best Regard
Gio
Am 17.08.2024 um 12:59 schrieb Giovanna Ratini:
Hello Eugen,
thank you for your answer.
I restarted all the kube-ceph nodes one after the other.
Nothing has changed.
ok, I deactivate the snap ... : ceph fs snap-schedule deactivate /
Is there a way to see how many snapshots will be deleted per hour?
Regards,
Gio
Am 17.08.2024 um 10:12 schrieb Eugen Block:
Hi,
have you tried to fail the mgr? Sometimes the PG stats are
not correct. You could also temporarily disable snapshots to
see if things settle down.
Zitat von Giovanna Ratini <giovanna.ratini@xxxxxxxxxxxxxxx>:
Hello all,
We use Ceph (v18.2.2) and Rook (1.14.3) as the CSI for a
Kubernetes environment. Last week, we had a problem with the
MDS falling behind on trimming every 4-5 days (GitHub issue
link). We resolved the issue using the steps outlined in the
GitHub issue.
We have 3 hosts (I know, I need to increase this as soon as
possible, and I will!) and 6 OSDs. After running the commands:
ceph config set mds mds_dir_max_commit_size 80,
ceph fs fail <fs_name>, and
ceph fs set <fs_name> joinable true,
After that, the snaptrim queue for our PGs has stopped
decreasing. All PGs of our CephFS are in either
active+clean+snaptrim_wait or active+clean+snaptrim states.
For example, the PG 3.12 is in the active+clean+snaptrim
state, and its snap_trimq_len was 4077 yesterday but has
increased to 4538 today.
I increased the osd_snap_trim_priority to 10 (ceph config
set osd osd_snap_trim_priority 10), but it didn't help. Only
the PGs of our CephFS have this problem.
Do you have any ideas on how we can resolve this issue?
Thanks in advance,
Giovanna
p.s. I'm not a ceph expert :-).
Faulkener asked me for more information, so here it is:
MDS Memory: 11GB
mds_cache_memory_limit: 11,811,160,064 bytes
root@kube-master02:~# ceph fs snap-schedule status /
{
"fs": "rook-cephfs",
"subvol": null,
"path": "/",
"rel_path": "/",
"schedule": "3h",
"retention": {"h": 24, "w": 4},
"start": "2024-05-05T00:00:00",
"created": "2024-05-05T17:28:18",
"first": "2024-05-05T18:00:00",
"last": "2024-08-15T18:00:00",
"last_pruned": "2024-08-15T18:00:00",
"created_count": 817,
"pruned_count": 817,
"active": true
}
I do not understand if the snapshots in the PGs are
correlated with the snapshots on CephFS. Until we
encountered the issue with the "MDS falling behind on
trimming every 4-5 days," we didn't have any problems with
snapshots.
Could someone explain me this or send me to the documentation?
Thank you
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--
Giovanna Ratini
Mail:ratini@xxxxxxxxxxxxxxxxxxxxxxxxx
Phone: +49 (0) 7531 88 - 4550
Technical Support
Data Analysis and Visualization Group
Department of Computer and Information Science
University of Konstanz (Box 78)
Universitätsstr. 10
78457 Konstanz, Germany
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--
Giovanna Ratini
Mail:ratini@xxxxxxxxxxxxxxxxxxxxxxxxx
Phone: +49 (0) 7531 88 - 4550
Technical Support
Data Analysis and Visualization Group
Department of Computer and Information Science
University of Konstanz (Box 78)
Universitätsstr. 10
78457 Konstanz, Germany
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