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#6 Re: Simple rotated backups with rsnapshot Posted by rihad (217.64.xx.xx) on Mon 17 Oct 2005 at 12:01 rsnapshot looks useful, although I haven't tried it. You can also try the dm-snapshot feature of LVM2 fame. For example: after you've migrated your /home partition to LVM2 (which, although straightforward, is a bit beyond the scope of this example), you could add the following line to root's personal crontab ("crontab -uroot -e"), @reboot /sbin/lvremove --force vg0/home.orig; /sbin/lvcreate --snapshot --size 4m --name home.orig vg0/home assuming your Logical Volume (LV == "partition") upong which /home gets mounted is named "home" and it lives on the Volume Group (VG == "hard disk") named "vg0", the command above gets the /home partitions's snapshot called "home.orig" to be recreated on every boot. You might need to tweak the --size argument, 4 megs might not be enough, YMMV. If the snapshot fills up it will get corrupted and you won't be able to use it any longer AFAIK (file -sL /dev/vg0/home.orig will barf ERROR: cannot read `/dev/vg0/home.orig' (Input/output error and in the output of lvdisplay vg0/home.orig it will be marked as INACTIVE) and you're gonna have to recreate it from scratch, other than that it works cool. One can always extend the size of a working snapshot before it fills up: lvextend --size +16m to add another 16 megs, etc.

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