[Gluster-users] Horrible Gluster Performance

Philip flips01 at googlemail.com
Fri Apr 13 09:25:58 UTC 2012

I have a small GlusterFS Cluster providing a replicated volume. Each server
has 2 SAS disks for the OS and logs and 22 SATA disks for the actual data
striped together as a RAID10 using MegaRAID SAS 9280-4i4e with this
configuration: http://pastebin.com/2xj4401J

Connected to this cluster are a few other servers with the native client
running nginx to serve files stored on it in the order of 3-10MB.

Right now a storage server has a outgoing bandwith of 300Mbit/s and the
busy rate of the raid array is at 30-40%. There are also strange
side-effects: Sometimes the io-latency skyrockets and there is no access
possible on the raid for >10 seconds. This happens at 300Mbit/s or
1000Mbit/s of outgoing bandwidth. The file system used is xfs and it has
been tuned to match the raid stripe size.

I've tested all sorts of gluster settings but none seem to have any effect
because of that I've reset the volume configuration and it is using the
default one.

Does anyone have an idea what could be the reason for such a bad
performance? 22 Disks in a RAID10 should deliver *way* more throughput.
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