There is definitely something wrong in how my cluster manages
osd_memory_target. For example, this is the situation for OSD 16:
# ceph config get osd.6 osd_memory_target
280584038
# ceph orch ps ogion --daemon_type osd --daemon_id 16
NAME HOST PORTS STATUS REFRESHED AGE MEM USE MEM LIM
VERSION IMAGE ID CONTAINER ID
osd.16 ogion running (21m) 6m ago 3d 568M 384M
17.2.3 df36836ad61e 35bf9c20dbeb
The memory limit seems to be correctly set (I disabled the memory
autotune on the host, set the limit manually with --force and rebooted
the host) but nevertheless the actual memory usage is far above the
limit (568M vs 384M).
How can this be? Am I overlooking something?
On 02/10/22 19:16, Nicola Mori wrote:
I attach two files with the requested info. Some more details: the
cluster has been deployed with cephadm using Ceph 17.2.3 image tweaked
with a small addition (a custom module for alerts). I guess the
configuration is almost vanilla since I changed very few things.
Thanks for your help.
Nicola
On 02/10/22 17:21, Joseph Mundackal wrote:
can you share `ceph daemon osd.8 config show` and `ceph config dump`?
On Sun, Oct 2, 2022 at 5:10 AM Nicola Mori <mori@xxxxxxxxxx
<mailto:mori@xxxxxxxxxx>> wrote:
Dear Ceph users,
I put together a cluster by reusing some (very) old machines with low
amounts of RAM, as low as 4 GB for the worst case. I'd need to set
osd_memory_target properly to avoid going OOM, but it seems there
is a
lower limit preventing me to do so consistently:
1) in the cluster logs I continuously get this message:
Unable to set osd_memory_target on ceph01 to 402653184: error
parsing
value: Value '831882342' is below minimum 939524096
2) if I try to set it manually I get this error:
# ceph config set osd.7 osd_memory_target 402653184
Error EINVAL: error parsing value: Value '402653184' is below
minimum
939524096
3) if I use the --force option then the value is set, but it is lost
after a osd restart
How can I fix this issue?
Thanks,
Nicola
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--
Nicola Mori, Ph.D.
INFN sezione di Firenze
Via Bruno Rossi 1, 50019 Sesto F.no (Italy)
+390554572660
mori@xxxxxxxxxx
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