At the moment, I would recommend using two drives in a raid1, and rsync to the third. Then use some scripts with sha1sum to compare between the raid and the rsync'd copy, which would effectively be a backup copy. You could use a fuse filesystem called chironfs http://www.furquim.org/chironfs/ to 'mirror' at the file level, and sha1 or diff to compare all the disks at some regular interval. chiron reads from the primary disk by default, and writes out to all disks. I don't know of anything that reads all, compares, tiebreaks, and repairs on each file access. I suspect that would perform quite badly. On Tue, Dec 9, 2008 at 07:55, peter.stevens <Peter.Stevens@xxxxxxxxx> wrote: > > I'm looking for a software solution to help replace my existing raid hardware > setup. The hardware mimics RAID-1 (in that it has 3 mirrors), except for the > fact that on read all 3 mirrors are compared and possibly error corrected > before data is returned. I don't neccessarily need a RAID-1 solution, it > just seems closer to what I already have and also that it also can recover > from 2 simulateous disk failures. > > So far I've played with a software RAID-1 array of USB flash drives. My > issue is that software RAID-1 does not check for or recover from data > corruption unless a read or write to disk actually fails. Integrity is a > major concern for me, I need to know that all data going to and from disk is > correct at all times. > > All advice and comments are welcomed. -- To unsubscribe from this list: send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
