Thanks for the hint, I tried turning that off:
$ sudo ceph osd pool get cephfs_data pg_autoscale_mode
pg_autoscale_mode: on
$ sudo ceph osd pool set cephfs_data pg_autoscale_mode off
set pool 9 pg_autoscale_mode to off
$ sudo ceph osd pool get cephfs_data pg_autoscale_mode
pg_autoscale_mode: off
Can I get rid of PGs after trying to decrease the number on the pool again?
Doing a backup and nuking the cluster seems a little too much work for me :)
$ sudo ceph osd pool get cephfs_data pg_num
pg_num: 128
$ sudo ceph osd pool set cephfs_data pg_num 16
$ sudo ceph osd pool get cephfs_data
> my OSDs are running odroid-hc4's and they only have about 4GB of memory,
> and every 10 minutes a random OSD crashes due to out of memory. Sadly the
> whole machine gets unresponsive when the memory gets completely full, so no
> ssh access or prometheus output in the meantime.
> I've set the
for example on of my latest osd crashes looks like this in dmesg:
[Dec 2 08:26] bstore_mempool invoked oom-killer:
gfp_mask=0x24200ca(GFP_HIGHUSER_MOVABLE), nodemask=0, order=0,
oom_score_adj=0
[ +0.06] bstore_mempool
cpuset=ed46e6fa52c1e40f13389b349c54e62dcc8c65d76c4c7860e2ff7c39444d14cc
