On 2/11/20 2:53 PM, Marc Roos wrote:
Say I think my cephfs is slow when I rsync to it, slower than it used to
be. First of all, I do not get why it reads so much data. I assume the
file attributes need to come from the mds server, so the rsync backup
should mostly cause writes not?
Are you running one or multiple MDS? I've seen cases where the
synchronization between the different MDS slow down rsync.
The problem is that rsync creates and renames files a lot. When doing
this with small files it can be very heavy for the MDS.
Wido
> I think it started being slow, after enabling snapshots on the file
> system.
>
> - how can I determine if mds_cache_memory_limit = 8000000000 is still
> correct?
>
> - how can I test the mds performance from the command line, so I can
> experiment with cpu power configurations, and see if this brings a
> significant change?
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