I didn't bring up experimental software - I thought that's what he was using. I misread. And it worked quite well, except for write speeds. There are some cool features with zfs. Trying to decide just what file system to use for these larger and larger arrays is something I've been facing very recently. I even tried Ubuntu LTS and server in the last week because of their native support for ext4. And even thought Ubuntu has some things right, I don't think it has everything right. So I'm waiting, like everyone else for centos 6. For me, the wait is mainly for better ext4 support. Along with any improvements with KVM. (Not that I have anything to complain about with KVM on 5.5) I doubt I'll be moving beyond 16TB, or whatever the limit of ext4 on centos is. Sorry to have offended you.