On 08/24/2010 10:20 PM, Marek Otahal wrote: > On Tuesday 24 of August 2010 23:03:23 Mauro Santos wrote: >> On 08/24/2010 08:14 PM, Marek Otahal wrote: >>> Hi all, >>> >>> I use dd command to make an image of entire /dev/sda (160GB) and back up >>> it as netobook.hdd to an external storage. The disk contains both >>> encrypted(dmcrypt/luks) and normal linux/win partitions. >>> >>> My question is, if my netbook died and I needed to recover from backup, >>> can I just dd-copy the image to a new larger disk? Does it matter? >>> >>> 1/ it will do, but the size will remain 160gb ..is ok. >>> 2/ will do & possibility to resize partitions later ..even better! :) >>> >>> I've searched the net, but I'd like someone to confirm it 100% works >>> (just dd and reboot). >>> >>> Thanks in advance, Marek >> >> Most probably you don't even need to copy the image back to a disk to >> get the files you need. I don't know about the encrypted(dmcrypt/luks) >> partitions but the "normal" linux/win partitions can be accessed >> directly from the image. > > Is that so? I like the restore to a functional computer ability, so copying > seems useful. But I was wondering how to mount a specific partition from an > image? (i make the image of whole /dev/sda, so sda1,2,..are hidden inside) > > greetings, Marek Usually I do it like this: - mount (?) the image to a loop device losetup /dev/loop0 /path/to/image/file - get the start of partitions parted /dev/loop0 unit B print take notice of the starting bytes for the partition you want to mount mount /dev/loop0 mnt_point -o offset=start_bytes and thats it, you should be able to access at least the "normal" partitions (read and write). I have never tried with encrypted partitions, I guess you would have to pass some extra options to mount. To unmount everything cleanly do: umount mnt_point losetup -d /dev/loop0 -- Mauro Santos
