1 Jun
2021
1 Jun
'21
5:43 p.m.
Hi,
I've never encountered this before.
To troubleshoot you could try to identify if this was caused by the
MDS writing to the metadata pool (e.g. maybe the mds log?), or if it
was some operation in the OSD which consumed too much space (e.g.
something like compaction?).
Can you find any unusual messages in the ceph.log or mds or osd logs
during the hours when the OSDs were growing?
Cheers, Dan
On Tue, Jun 1, 2021 at 12:24 PM Hervé Ballans
<herve.ballans(a)ias.u-psud.fr> wrote:
>
> Hi all,
>
> Ceph Nautilus 14.2.16.
>
> We encounter a strange and critical poblem since this morning.
>
> Our cephfs metadata pool suddenly grew from 2,7% to 100%! (in less than
> 5 hours) while there is no significant activities on the OSD data !
>
> Here are some numbers:
>
> # ceph df
> RAW STORAGE:
> CLASS SIZE AVAIL USED RAW USED %RAW USED
> hdd 205 TiB 103 TiB 102 TiB 102 TiB 49.68
> nvme 4.4 TiB 2.2 TiB 2.1 TiB 2.2 TiB 49.63
> TOTAL 210 TiB 105 TiB 104 TiB 104 TiB 49.68
>
> POOLS:
> POOL ID PGS STORED OBJECTS
> USED %USED MAX AVAIL
> cephfs_data_home 7 512 11 TiB 22.58M 11
> TiB 18.31 17 TiB
> cephfs_metadata_home 8 128 724 GiB 2.32M 724
> GiB 100.00 0 B
> rbd_backup_vms 9 1024 19 TiB 5.00M 19
> TiB 37.08 11 TiB
>
>
> The cephfs_data uses less than the half of the storage space, and there
> was no significant increase during the period (and before) where
> metadata became full.
>
> Is someone already encounter that ?
>
> Currently, I have no idea how I can solve this problem. The restart of
> associated OSD and mds services have not been useful.
>
> Let me know if you want more informations or logs.
>
> Thank you for your help.
>
> Regards,
> Hervé
>
>
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