[ovirt-devel] Low Performance Issue

I've setup oVirt HCI over 3 servers. Each server has 1* 480 GB SSD, 5* 1.8 TB SAS HDD with oVirt version 4.3.3 But I am still able to get low performance. Can anyone suggest the tuning variables for Gluster volume. Remark :What should the value be set for network.remote-dio= enable / disable ?