Hi all,
We are running a small cluster with three nodes and 6-8 OSDs each.
The OSDs are SSDs with sizes from 2 to 4 TB. Crush map is configured so
all data is replicated to each node.
The Ceph version is Ceph 15.2.6.
Today I deleted 4 Snapshots of the same two 400GB and 500GB rbd volumes.
Shor
Hi Frank,
Thanks for getting back!
- ceph version
15.2.6 (now upgraded to 15.2.8 and I was able to reproduce the issue)
- rbd image config (meta- and data pool the same/different?)
We are not using EC but regular replicated pools, so I assume meta and
data pool are the same?
- how many PGs d
I made the suggested changes.
(Un)fortunately I am not able to reproduce the issue anymore. Neither
with the original settings nor the updated setting.
This may be due to the fact that the problematic snapshots have been
removed/trimmed now.
When I make new snapshots of the same volumes, they a
Hi Pascal,
can you add a bit more information:
- ceph version
- rbd image config (meta- and data pool the same/different?)
- how many PGs do the affected pools have
- how many PGs per OSD (as stated by ceph osd df tree)
- what type of SSDs, do they have power loss protection, is write cache disab
>> - do you have bluefs_buffered_io set to true
> No
Try setting it to true.
> Is there anything specific I can do to check the write cache configuration?
Yes, "smartctl -g wcache DEVICE" will tell you if writeback cache is disabled.
If not, use "smartctl -s wcache=off DEVICE" to disable it. No
SSDs are not equal to high performance:
https://yourcmc.ru/wiki/index.php?title=Ceph_performance&mobileaction=toggle_view_desktop
Depending on your model, performance can be very poor.
Best regards,
=
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
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When the below was first published my team tried to reproduce, and couldn’t. A
couple of factors likely contribute to differing behavior:
* _Micron 5100_ for example isn’t a model, the 5100 _Eco_, _Pro_, and _Max_ are
different beasts. Similarly, implementation and firmware details vary by dri
I would like to use the Cephfs Snapshot feature, which version of Ceph supports
it
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