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

[Antonin Kral <A.Kral@xxxxxxxx>]

Hello again,

I would like to update my previous post. I was almost decided to go with
CLVM on the top of the DRBD, but I found the note in docs, that
snapshotting is not cluster aware (
http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Cluster_Logical_Volume_Manager/cluster_activation.html
)

So the setup for migration and backups could be, that Heartbeat2 will be
used for managing activation of domU and LV, while DRBD will be in
dual-primary mode.

Could anybody share some BCP on the setup? Thank you,

    Antonin

* Antonin Kral <A.Kral@xxxxxxxx> [2009-01-13 07:38] wrote:
> 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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