Hi,
at the moment i'm running a gentoo box as fileserver, the setup is as
follows:
-----------------------------------
| Ext4 |
-----------------------------------
^
|
-----------------------------------
| LUKS |
-----------------------------------
^
|
-----------------------------------
| MD Raid 10 |
-----------------------------------
^ ^ ^ ^
| | | |
----- ----- ----- -----
| hd0 | | hd1 | | hd2 | | hd3 |
----- ----- ----- -----
Besides other features, I'd like to have a snapshot functionality, and I
don't want to introduce an additional layer by using LVM. So I'm
thinking about to migrate to Btrfs.
Btrfs supports Raid10 but no block-crypto.
If I would use a HD->MD Raid->Luks->Btrfs stack, I don't benefit from
the Raid implementation of Btrfs.
If I would use a HD->Luks->Btrfs stack, then I would have to use four
different LUKS devices, which results in four individual encryptions
(and I don't have AES-NI, so this would be a tremendous slowdown).
What would be the best way to have a Raid 10 together with a encrypted
Btrfs?
--
Besides that I would have to live-migrate the Raid10 as I don't have any
spare hdd to cache the data. So I would have to degrade my Raid10.
Is it possible to create a degraded Btrfs?
Please don't tell me that this is insanely dangerous, I know it is ;-)
Cheers
Ralf
