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On Tue, 20 Oct 2009, ste@xxxxxxxxxxxxxxxxx wrote:
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.
It's not an un-common scenario. You satisfy the google requirement of 3 copies and 1 is off-site... LVM, while nice, just gets in the way and adds to the complication factor.
Gordon -- 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