On Tue, Jun 26, 2012 at 03:10:30AM +0800, Emmanuel Noobadmin wrote: > On 6/25/12, Warren Young <warren at etr-usa.com> wrote: > > Then there's the LVM option, but I can't immediately come up with a > > one-liner that tells you whether a given LVM disk set is equivalent to > > software RAID. > > LVM has a mirroring option but from, possibly outdated, reading a > couple of years back, it is not as smart as md raid when it comes to > using both disks to speed up reading and will only read from one disk. Also, nobody uses it. If you hit a problem, you are completely on your own. I thought it would be more simple to have only one abstraction layer; Nope. Use md and lvm on top of the md.