On Wed, 10 Aug 2011 14:44:38 +0200 Sun_Blood <sblood@xxxxxxxxx> wrote: > ... > > A final question that is more LVM but it sounds like you have some > knowledge in this area. My setup is LVM -> LUKS -> Filesystem. > If I use LVM snappshots on the LVM will the LUKS header also be > backuped because it's on top of LVM? That depends. As an example: Let's assume that /dev/mapper/sda is a linear mapping of /dev/sda. cat /dev/zero > /dev/mapper/sda: snapshotting could preserve overwritten data cat /dev/zero > /dev/sda: you are bypassing device mapper and overwritting "form below" device mapper. So it can't do anything. Snapshotting does not create physical copies of the snapshotted volume automatically! Data will only be copied, if it is modified "from above" in the original volume. So, snapshotting is a very bad way to protect against accidental header corruption and other forms of damage in lower levels. In general, snapshots are no replacement for backups but can be a powerful addition. Regards, Marc _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
