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): /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, -- Tobias Andersson ------ Please avoid sending me Word, Excel or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html
