Hi,
we have a cluster with 7 nodes each with 10 SSD OSDs providing CephFS to
a CloudStack system as primary storage.
When copying a large file into the root directory of the CephFS the
bandwidth drops from 500MB/s to 50MB/s after around 30 seconds. We see
some MDS activity in the output of "ceph fs status" at the same time.
When copying the same file to a subdirectory of the CephFS the
performance stays at 500MB/s for the whole time. MDS activity does not
seems to influence the performance here.
There are appr 270 other files in the root directory. CloudStack stores
VM images in qcow2 format there.
Is this a known issue?
Is there something special with the root directory of a CephFS wrt write
performance?
Regards
--
Robert Sander
Heinlein Consulting GmbH
Schwedter Str. 8/9b, 10119 Berlin
http://www.heinlein-support.de
Tel: 030 / 405051-43
Fax: 030 / 405051-19
Zwangsangaben lt. §35a GmbHG:
HRB 220009 B / Amtsgericht Berlin-Charlottenburg,
Geschäftsführer: Peer Heinlein -- Sitz: Berlin
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