| 1 |
Hi, |
| 2 |
|
| 3 |
at the moment i'm running a gentoo box as fileserver, the setup is as |
| 4 |
follows: |
| 5 |
|
| 6 |
----------------------------------- |
| 7 |
| Ext4 | |
| 8 |
----------------------------------- |
| 9 |
^ |
| 10 |
| |
| 11 |
----------------------------------- |
| 12 |
| LUKS | |
| 13 |
----------------------------------- |
| 14 |
^ |
| 15 |
| |
| 16 |
----------------------------------- |
| 17 |
| MD Raid 10 | |
| 18 |
----------------------------------- |
| 19 |
^ ^ ^ ^ |
| 20 |
| | | | |
| 21 |
----- ----- ----- ----- |
| 22 |
| hd0 | | hd1 | | hd2 | | hd3 | |
| 23 |
----- ----- ----- ----- |
| 24 |
|
| 25 |
|
| 26 |
Besides other features, I'd like to have a snapshot functionality, and I |
| 27 |
don't want to introduce an additional layer by using LVM. So I'm |
| 28 |
thinking about to migrate to Btrfs. |
| 29 |
|
| 30 |
Btrfs supports Raid10 but no block-crypto. |
| 31 |
|
| 32 |
If I would use a HD->MD Raid->Luks->Btrfs stack, I don't benefit from |
| 33 |
the Raid implementation of Btrfs. |
| 34 |
If I would use a HD->Luks->Btrfs stack, then I would have to use four |
| 35 |
different LUKS devices, which results in four individual encryptions |
| 36 |
(and I don't have AES-NI, so this would be a tremendous slowdown). |
| 37 |
|
| 38 |
What would be the best way to have a Raid 10 together with a encrypted |
| 39 |
Btrfs? |
| 40 |
|
| 41 |
-- |
| 42 |
|
| 43 |
Besides that I would have to live-migrate the Raid10 as I don't have any |
| 44 |
spare hdd to cache the data. So I would have to degrade my Raid10. |
| 45 |
Is it possible to create a degraded Btrfs? |
| 46 |
|
| 47 |
Please don't tell me that this is insanely dangerous, I know it is ;-) |
| 48 |
|
| 49 |
Cheers |
| 50 |
Ralf |
Archives