On 24 August 2010 16:02, Mauro Santos <registo.mailling@xxxxxxxxx> wrote: > 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 > But why? The loop module supports partitions now, just modprobe it with max_part=10 or something. The partitions will be /dev/loop0p[1234...]. -- Tavian Barnes
