On 01/25/2012 01:35 PM, Tobias Andersson wrote: > Hi, > > I am currently doing some performance tests with GlusterFS to see if it > would be possible to replace our current storage infrastructure with > SATA/RAID10 servers in a GlusterFS replica. Everything looks good on the > paper and the setup was smooth. > > However when it comes to write speed its not really what I was hoping > for. Here are some stats: > > --------- > > Write test 1, VM-HOST (Debian 6, GlusterFS on /vm_storage): > > storage1:/cloud on /vm_storage type fuse.glusterfs > (rw,allow_other,default_permissions,max_read=131072) > > echo 3 > /proc/sys/vm/drop_caches > time dd if=/dev/zero of=./bigfile bs=1M count=5000 > > Result: > > 5000+0 records in > 5000+0 records out > 5242880000 bytes (5.2 GB) copied, 101.464 s, 51.7 MB/s > > real 1m41.725s > user 0m0.004s > sys 0m3.104s > > --------- > > Write test 2, VM (Debian 6, VirtIO, stored as qcow2 on /vm_storage): This might be interesting regarding qcow2 performance: http://www.linux-kvm.org/page/Qcow2 Regards, Andreas -- Need help with High Availability clustering? http://www.hastexo.com/now > > /dev/vda2 on / type ext4 (rw,errors=remount-ro) > > echo 3 > /proc/sys/vm/drop_caches > time dd if=/dev/zero of=./bigfile bs=1M count=5000 > > Result: > > 5000+0 records in > 5000+0 records out > 5242880000 bytes (5.2 GB) copied, 796.309 s, 6.6 MB/s > > real 13m16.626s > user 0m0.000s > sys 0m3.700s > > --------- > > Conclusion: > > 51 MB/s on KVM-HOST is as expected, my uplink goes almost full with > around 400-450Mbps to each GlusterFS storage node. > > The problem appears only when doing benchmark within the KVM Virtual > Machine. Write speeds are really poor (6.6 MB/s), however read is fine. > > I've tried both 3.2.5 and 3.3 beta2 with no luck. > > Is this a known issue? Have I missed something? Some performance tweaks > maybe? > > Best regards, > -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 222 bytes Desc: OpenPGP digital signature URL: <http://gluster.org/pipermail/gluster-users/attachments/20120125/db015522/attachment.pgp>
