[ovirt-users] gluster performance oVirt 3.4

[Vijay Bellur]

On 05/11/2014 02:04 AM, Vadims Korsaks wrote:
> HI!
>
> Created 2 node setup with oVirt 3.4 and CentOS 6.5, for storage created
> 2 node replicated gluster (3.5) fs on same hosts with oVirt.
> mount looks like this:
> 127.0.0.1:/gluster01 on
> /rhev/data-center/mnt/glusterSD/127.0.0.1:_gluster01 type fuse.glusterfs
> (rw,default_permissions,allow_other,max_read=131072)
>
> when i making gluster test with dd, something like
> dd if=/dev/zero bs=1M count=20000
> of=/rhev/data-center/mnt/glusterSD/127.0.0.1\:_gluster01/kaka
> i'm gettting speed ~ 110 MB/s, so this is 1Gbps speed of ethernet adapter
>
> but with in VM created in oVirt speed is lower than 20 MB/s
>
> why there is so huge difference?
> how can improve VMs disks speed?
>

What are your gluster volume settings? Have you applied the following 
performance tunables in gluster's virt profile:

eager-lock=enable
remote-dio=enable

Regards,
Vijay