[DRBD-user] Best practice: drbd+lvm+gfs2+dm-crypt on dual primary

Digimer lists at alteeve.ca
Mon Feb 2 20:46:19 CET 2015

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On 02/02/15 02:44 PM, Ivan wrote:
>>> I'm not sure that two (or more) LUKS partitions are identical given
>>> exactly the same cleartext content and the same keys. There must be some
>>> kind of sector randomization when writing data to make cryptoanalysis
>>> harder, so it makes me think that it's not the case (that would require
>>> testing though).
>>> If I'm right, I don't see how DRBD could work in that setup. (or maybe I
>>> just need more sleep).
>> LUKS is working on the LV, which will be backed by the PV on DRBD. DRBD
>> doesn't know data, so it will simply replicate the LUKS structure
>> faithfully to both nodes.
>> Remember, for all intent and purpose, there is only one device/luks
>> partition. DRBD is really no different from LUKS on /dev/mdX devices in
>> this regard.
> ah that's right - indeed more sleep needed. I've skipped the "clustered
> LVM" part and was thinking about two luks partitions.
> sorry for the noise.

No worries at all. When you ask a question like this, you have a chance 
to learn a system better, so it's good. :)

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