[ovirt-users] Gluster volume slower then raid1 zpool speed

Hi, Can anyone help me with the performance on my 3 node gluster on zfs (it is setup with one arbiter) The performance on the single vm I have on it (with engine) is 50% worse then a single bare metal disk, on the writes. I have enabled "Optimize for virt store" I run 1Gbps 1500MTU network, could this be the write performance killer? Is this to be expected from a 2xHDD zfs raid one on each node, with 3xNode arbiter setup? Maybe I should move to raid 5 or 6? Maybe I should add SSD cache to raid1 zfs zpools? What are your thoughts? What to do for optimize this setup? I would like to run zfs with gluster and I can deal with a little performance loss, but not that much.