Hi,
I don't think increasing the PGs has an impact on the OSD's memory, at
least I'm not aware of such reports and haven't seen it myself. But
your cluster could get in trouble as it already is, only 24 GB for 16
OSDs is too low. It can work (and apparently does) when everything is
calm, but during recovery the memory usage spikes. The default is 4 GB
per OSD, there have been several reports over the years where users
couldn't get their OSDs back up after a failure because of low memory
settings. I'd recommend to increase RAM.
Regards,
Eugen
Zitat von Nicola Mori <mori@xxxxxxxxxx>:
Dear Ceph user,
I'm wondering how much an increase of PG number would impact on the
memory occupancy of OSD daemons. In my cluster I currently have 512
PGs and I would like to increase it to 1024 to mitigate some disk
occupancy issues, but having machines with low amount of memory
(down to 24 GB for 16 OSDs) I fear this could kill my cluster. Is it
possible to evaluate the relative increase in OSD memory footprint
when doubling the number of PGs (hopefully not a linear scaling)? Or
is there a way to experiment without crashing everything?
Thank you.
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