[dm-crypt] moving/resizing a dm-crypt partition

Sven Eschenberg sven at whgl.uni-frankfurt.de
Thu Jan 30 17:28:18 CET 2014


Hi,

potentially you could 'keep' your old luks header and copy it over
(backup+restore) to the new partition, if you plan on keeping masterkey,
passwords, uuid.

Is there a better way? Depends on what you call better?

faster/safer?

Imho your plan should be the safest version and that's probably what you
want, esp. if part. 5 has enough space to hold what's on part 6 (So you
would have your data twice just to make sure everythink is okay.

If you want to be safer: Make another backup on an extra storage device
before resizing part5. I am not sure how stable btrfs is.

Regards

-Sven

On Thu, January 30, 2014 17:04, Louis-David Mitterrand wrote:
> Hi,
>
> My linux system is on a dm-crypt volume with btrfs on /dev/sda6. As I
> just recovered 100GB from windows (/dev/sda5) I'd like to merge 5 and 6
> to have a larger dm-crypt volume. Here is the disk layout:
>
>    1            2048         2050047   1000.0 MiB  2700  Basic data
> partition
>    2         2050048         2582527   260.0 MiB   EF00  EFI system
> partition
>    3         2582528         4630527   1000.0 MiB  8300  Basic data
> partition
>    4         4630528         4892671   128.0 MiB   0C01  Microsoft
> reserved part
>    5         4892672       218167295   101.7 GiB   8300  Basic data
> partition
>    6       464865280      1000215182   255.3 GiB   8300  Linux filesystem
>
> What is the best strategy to acheive that? I'm thinking of booting a
> live cd, creating a new dm-crypt volume on 5, copy the system from 6 to
> 5, remove 6, resize partition 5, cryptfs resize 5, btrfs resize 5.
>
> Is there a better way?
>
> Thanks,
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> dm-crypt at saout.de
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>




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