No, our osds are hdd (no ssd) and we have everything (data and metadata)
on them (no nvme).
Le 17/11/2021 à 16:49, Arthur Outhenin-Chalandre a écrit :
Hi,
On 11/17/21 16:09, Francois Legrand wrote:
Now we are investingating this snapshot issue and I noticed that as
long as we remove one snapshot alone, things seems to go well (only
some pgs in "unknown state" but no global warning nor slow ops, osd
down or crash). But if we remove several snapshots at the same time
(I tryed with 2 for the moment), then we start to have some slow ops.
I guess that if I remove 4 or 5 snapshots at the same time I will end
with osds marked down and/or crash as we had just after the upgrade
(I am not sure I want to try that with our production cluster).
Maybe you want to try to tweak `osd_snap_trim_sleep`. On
Octopus/Pacific with hybrid OSDs the snapshots deletions seems pretty
stable in our testing. Out of curiosity are your OSD on SSD? I suspect
that the default setting of `osd_snap_trim_sleep` for SSD OSD could
affect performance [1].
Cheers,
[1]:
https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/message/FPRB2DW4N427U25LEHYICOKI4C37BKSO/
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