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
------
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See http://www.gnu.org/philosophy/no-word-attachments.html
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