[Xen-users] DRBD and Xen - LVM on the top or not

[Antonin Kral <A.Kral@xxxxxxxx>]

Hello,

I am evaluating setup for our small cluster of two (maybe 4 at the end)
machines to have ha setup with support for live migrations and
snapshotting. I have ended up with two possible scenarios:

  a) HDD -> LVM -> DRBD -> Xen domU
  b) HDD -> LVM -> DRBD -> CLVM -> Xen domU

Option a) looks nicer to be because it is a bit simpler and I assume
(maybe incorrectly) that DRBD synchronization in case of failure will be
faster and I feel a little bit safer with no need for day-to-day dual
master (primary) DRBD. On the other hand, I am a bit curious about
snapshotting - is it safe to do LVM LV snapshot under the DRBD device?

I would also need to run multi-master actively with option b), right? 

Does anybody have such setup in day-to-day deployment?

I would appreciate any advices, thank you,

    Antonin

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