[dm-crypt] filesystem conversion guidance needed

Arno Wagner arno at wagner.name
Thu Feb 28 15:47:25 CET 2013

While it is possible to do something like this in-place,
any mistake can permanentely destroy all your data. So an
absolute requirement is a complete backup (see FAQ for tips for 
secure backup).

Now, swap is usually not put on RAID, so you can just let 
it be as it is.

For the others, encryption is usually placed on top of
RAID, so here is what you can do:

1. Make degraded RAID1 partitions on the new drive
   (put in "missing" for the missing partitions.
2. Copy the data over.
3. Reboot using the new RAID devices for boot/root
4. Sync the old partitions into the RAID devices.

- You need to make the new partitions exactly (!) the
  same size as the old ones aor smaller. Or you
  need to repartition the old drive between steps
  3. and 4. accordingly
- I recomend using partition type 0xfb end kernel-level
  autodetection. For this to work, you have to use
  MD superblock version 0.90.


On Thu, Feb 28, 2013 at 08:37:21AM -0600, lxnf98mm at gmail.com wrote:
> I have a setup with 1 drive
> The root, swap, and data partitions are encrypted
> I want to add a second drive and convert all partitions to raid 1 encrypted
> Can I do this conversion safely or do I need to start from scratch
> If so I would appreciate a bit of procedure guidance
> I have
> Debian 6.0.5
> kernel 3.4.4
> cryptsetup 1.4.1
> Thanks
> Richard
> _______________________________________________
> dm-crypt mailing list
> dm-crypt at saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt

Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
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One of the painful things about our time is that those who feel certainty
are stupid, and those with any imagination and understanding are filled
with doubt and indecision. -- Bertrand Russell

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