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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