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 pg_num
pg_num: 128
Am Fr., 2. Dez. 2022 um 10:22 Uhr schrieb Janne Johansson <
icepic.dz@xxxxxxxxx>:
> > 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 memory limit very low on all OSDs:
> >
> > for i in {0..17} ; do sudo ceph config set osd.$i osd_memory_target
> > 939524096 ; done which is the absolute minimum, about 0.9GB.
> >
> > Why are the OSDs not respecting this limit?
>
> The memory limit you set with osd_memory_target is about the parts
> that _can_ scale up and down memory usage, like read caches and so
> forth, but it is not all of the needed RAM to run an OSD with many
> PGs/Objects. If the box is too small, it is too small.
>
> --
> May the most significant bit of your life be positive.
>
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