[ceph-users] Increasing mon_pg_warn_max_per_osd in v12.2.2

Fabian Grünbichler f.gruenbichler at proxmox.com
Mon Dec 4 02:31:31 PST 2017


On Mon, Dec 04, 2017 at 11:21:42AM +0100, SOLTECSIS - Victor Rodriguez Cortes wrote:
> 
> > Why are you OK with this? A high amount of PGs can cause serious peering issues. OSDs might eat up a lot of memory and CPU after a reboot or such.
> >
> > Wido
> 
> Mainly because there was no warning at all in v12.2.1 and it just
> appeared after upgrading to v12.2.2. Besides,its not a "too high" number
> of PGs for this environment and no CPU/peering issues have been detected
> yet.
> 
> I'll plan a way to create new OSD's/new CephFS and move files to it, but
> in the mean time I would like to just increase that variable, which is
> supposed to be supported and easy.
> 
> Thanks

the option is now called 'mon_max_pg_per_osd'.

this was originally slated for v12.2.1 where it was erroneously
mentioned in the release notes[1] despite note being part of the
release (I remember asking for updated/fixed release notes after 12.2.1,
seems like that never happened?). now it was applied as part of v12.2.2,
but is not mentioned at all in the release notes[2]...

1: http://docs.ceph.com/docs/master/release-notes/#v12-2-1-luminous
2: http://docs.ceph.com/docs/master/release-notes/#v12-2-2-luminous



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