On Wednesday 25 of August 2010 01:02:21 Mauro Santos wrote: > On 08/24/2010 11:44 PM, Tavian Barnes wrote: > > 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...]. > > Nice tip. I've been using this method for quite a while so either it > wasn't available when I started using it or I missed the fact that the > module option is needed for this to work. thank you very much both of you! I'll use the modprobe w/ max_part argument solution. -- Marek Otahal :o)
