Re: [Xen-users] AoE LVM2 DRBD Xen Setup

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Oct 12, 2006 at 12:09:56PM +0200, Bjoern Metzdorf wrote:
> Hello everybody,
> 
> I am in the process of setting up a really cool xen serverfarm. Backend 
> storage will be an LVMed AoE-device on top of DRBD.
> 
> The goal is to have the backend storage completely redundant.
> 
> Picture:
> 
> |RAID|         |RAID|
> |DRBD1| <----> |DRBD2|
>        \      /
>         |VMAC|
>        | AoE  |
>     |global LVM VG|
>       /   |    \
> |Dom0a| |Dom0b| |Dom0c|
>    |      |        |
>    |      |        |
> |LVMLV1| |LVMLV2|  |LVMLV3|
> |DomU1|  |DomU2|   |DomU3|
> 
> Each Dom0 has the global LVM VG visible but only uses the relevant LVs 
> for its DomUs.
> 
> There are two open questions for me:
> 
> 1. Is is possible to failover AoE from drbd1 to drbd2? Did anyone try 
> this yet? Normal drbd-setups use heartbeat with a virtual IP for 
> failover, but in this case I need a virtual Mac, since AoE is layer2.
> 
> Does an AoE-Client recognize mac-changes automatically (I don't think 
> so), or do I have to "failover" a custom virtual mac with "ip set 
> hwaddr" or such?
> 
> In the archives I didn't find anything close to it.
> 
> 2. Do I need the Redhat-Cluster-framework for this to work? If I make 
> changes to the shared LVM VG (e.g. create a new LV for a new DomU), I 
> have to execute vgscan on all Dom0s.
> This would not be necessary if I would use the cluster framework. But I 
> don't need GFS or such, so I don't want to add additional complexity. 
> But perhaps I have overseen some metadata problems here? Anyone? :)
> 

You need CLVM ("Cluster LVM") from Redhat-Cluster-framework. No need for
GFS.

-- Pasi

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