Hello,
I'm running ceph pacific OSD servers that are orchestratedy by cephadm (on
docker.io v20.10.8 on CentOS 7.9). The servers are a bit ... low equipped
than others when it comes to memory per OSD.
Earlier, we were able to accommodate for this by using the following
/etc/ceph/ceph.conf setting:
[osd]
osd memory target = 2147483648
However, since I have switched to cephadm and pacific (I guess this issue
is more related to the earlier than the latter), I'm seeing top/htop output
that indicates that 50% of my memory is used by processes and the other 50%
are used by "buff/cache".
# free -h
total used free shared buff/cache
available
Mem: 251G 105G 24G 1.5G 121G
132G
Swap: 7.8G 40M 7.7G
I'm seeing issues such as mon slowing down and going out of quorum that I
saw earlier when memory was tight. Thus, I'm assuming that memory is the
issue here again...
Thanks,
Manuel
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