Yes, the only thing which brings the wirte I/O almost on my Host Level is by enabling viodiskcache = writeback.

As far as i can tell this is caching enabled for the guest and the host which is critical if sudden power loss happens.

Can i turn this is on if i have a BBU in my Host System?

On Sun, Feb 9, 2014 at 6:25 PM, Vijay Bellur <vbellur@redhat.com> wrote:

On 02/09/2014 09:11 PM, ml ml wrote:

I am on Cent OS 6.5 and i am using:

[root@node1 ~]# rpm -qa | grep gluster
glusterfs-rdma-3.4.2-1.el6.x86_64
glusterfs-server-3.4.2-1.el6.x86_64
glusterfs-fuse-3.4.2-1.el6.x86_64
glusterfs-libs-3.4.2-1.el6.x86_64
glusterfs-3.4.2-1.el6.x86_64
glusterfs-api-3.4.2-1.el6.x86_64
glusterfs-cli-3.4.2-1.el6.x86_64
vdsm-gluster-4.13.3-3.el6.noarch

Have you turned on "Optimize for Virt Store" for the gluster volume?

-Vijay