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> 2 USB drives where periodically rsync is run to duplicate drive 1 onto > drive 2. Drive 1 is static, drive 2 (should) get removed every evening > and taken off-site. > > If the two drives were setup in a software-based RAID-1 (mirror) > configuration, would they automatically reconcile any differences when > drive 2 was re-attached? If not, how can differences between two > software RAID-0 drives be reconciled? Is there a command that initiate > the reconciliation? Can this be added to a udev rule so that when > drive 2 is re-attached the reconciliation happens automatically? --snip-- Interesting. I guess you could do that, but I'm not sure why you'd want to. Why are you taking the redundant disk off site? This smells a bit like the old backup vs redundancy confusion. Any way, maybe LVM snapshots are what you really want? They'll let you capture a whole, consistent filesystem image while it's still in use. Steve. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html