I have an IBM x346 with dual 3.2Ghz Xeons and 2x36GB 15k SCSI disks. I'm running an entirely ZFS-based install of FreeBSD 8.1.
I can configure the bios to mirror the two disks, and then put ZFS on that "single" drive, or I can mirror the drives using ZFS, and install to that.
If I go the all-ZFS route, I suppose I have a little more freedom with how I use the devices (I could set up a fast non-redundant striped area, in addition to my mirrored system install, for example). Do I gain anything as far as error correction goes? Rebuild performance/ease/time?
I know that both configurations are probably the same to within a gnat's eyelash, but I'd like a second opinion.