[Gluster-users] Performance problems with glusterfs

[Erik Schwalbe]

Hello, 

I installed a trial version of Gluster Storage Software Appliance last week. 
At the moment I do some performance tests on the server. 
I use Ubuntu Server 11.10 as OS. 
Hardware (2x): 
-AMD Opteron Quad Core 2.2GHz 
-16GB RAM 
-12x WD 2TB HDD @ 7200rpm 
-10Gbit link between the servers 

I use zfs as filesystem. 
Glusterfs version 3.2.1, but I also installed 3.2.4 for testing (same behaviour). 

ZFS is mounted to /data: 
dd if=/dev/zero of=/data/LUN0 bs=1M count=20240 
21223178240 Bytes (21 GB) kopiert, 13.6647 s, 1.6 GB/s 

create a glusterfs volume (without replication for testing local speed): 
gluster volume create test-volume san0:/data/test-volume 

and mount: 
mount -t glusterfs san0:/test-volume /mnt 

dd if=/dev/zero of=/mnt/LUN0 bs=1M count=20240 
21223178240 Bytes (21 GB) kopiert, 79.0924 s, 268 MB/s 

I also do some tests with bonnie++. The result you can find as attachment. 

As you can see, glusterfs mount is much slower than the local zfs mount. 
During the dd and bonnie++ tests (glusterfs mount) the cpu load for glusterd and glusterfs processes is much more than 100% (150%-170%) 

Is this the normal behaviour of glusterfs?? Or Is the Quad core cpu to slow?? 

Thank you for help. 

Regards, 
Erik Schwalbe 


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