rolling back a LVM snapshot involves dding off the snapshot, and on to whatever you want your production disk to be (or just running off the snapshot forever, which has.... performance consequences with LVM.)

Yes, LVM snapshots exist, but they are of limited utility compared to ZFS and the like.

I've been experimenting with CentOS6 and ZFS on Linux; so far it looks pretty good. it handles failing consumer grade hard drives vastly better than lvm on md, and snapshots are inexpensive.

You can also roll back lvm snapshots using the merge option

https://access.redhat.com/documentation/en-US/Red_Hat_Enterp...

nice. I had not seen that before... that makes it a lot more useful.

Oh yes, LVM is abhorrent, along with mdadm.

Thats why I'm not so happy about the direction the tools are going with BTRFS. If ZFS isn't around, LVM is your only real option.

However, RHEL usually sets up LVM, so you might as well use it.