[ClusterLabs] DRBD or SAN ?

Digimer lists at alteeve.ca
Tue Jul 18 14:35:24 EDT 2017

On 2017-07-18 02:29 PM, Lentes, Bernd wrote:
>>> On SLES 11 SP4 HAE DRBD 8.4 is available. Do i need a cluster fs on top of a
>>> dual primary DRBD ?
>>> I assume.
>>> Bernd
>> Depends.
>> If you want to have a shared FS, yes. If you want to back VMs though, we
>> use clustered LVM to manage the DRBD space, creating per-VM LVs, and
>> then use the resource manager to manage the servers. This keeps the LVM
>> data in sync and avoids the cost of cluster locking.
> Hi Digimer,
> just to be clear: we have already cLVM because i'd like to store the vm's in plain logical volumes, without fs.
> That's running already. If i want live migration of vm's which resides on the plain logical volumes in conjunction with DRBD
> (DRBD on top of the lv ?) i don't need a cluster fs ?
> Thanks for the clarification.
> Bernd

If you have DRBD (PV) -> Clustered VG -> LV per VM, and you have
dual-primary DRBD, you can already do a live migration.

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