Interesting, I did something similar just a few weeks back, flattening
some images (didn’t look at their sizes or overlaps of the snapshots).
But I don’t see any spikes in memory usage at all. At that time the
cluster was running latest Pacific.
Zitat von Dominique Ramaekers <dominique.ramaek...@cometal.be>:
Hi,
Housekeeping... I was cleaning up my snapshots and was flattening
clones... Suddenly I ran out of memory on my nodes!
4 node cluster with each 10 ssd osd's with total storage size 25TiB.
Each node has about 45 GiB of free (available) memory in normal
operation.
After flattening several images and removing dozens of snapshots,
the free memory probably was already lower than the usual 45GiB. I
was flattening an image of 75GiB and 2 out of 4 nodes ran out of
memory. One node even automatically killed processes randomly to
free up memory... After regaining control over the system, I put
that node in maintenance and rebooted this node. After reboot the
free mem was like 70Gib. Over night all of the nodes were back on
the usual 45GiB.
Today I checked the free mem of each node: 45GiB free. So I
flattened again an image of 75GiB. And yes, the free mem dropped
from 45GiB to 5GiB really fast!
Is there a way to avoid this behavior of the cluster?
Greetings,
Dominique.
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