Re: CentOS Cluster LVM

From: "Pete Zaitcev", Monday, May 04, 2009 10:51 AM

> On Mon, 4 May 2009 09:40:56 -0600, "Ed Heron" <[email protected]> wrote:
>
>>   Anybody using clustered LVM on CentOS 5 to provide drive space for 
>> virtual
>> machines on a GNU/Linux/Xen host?
>
> Not I, but it would be interesting to hear if anyone does it.

  I will share my experiences.  This very cool stuff.

>>   The docs for Clustered LVM appear to suggest the storage server could
>> mirror the virtual drive space onto another storage server on the fly. 
>> This
>> could provide a low apparent cost redundant system.
>
> Do you mean that there's no man-hour cost associated with learning
> setting up Xen-based active migration or how Xen incurs capacity
> costs?

  No.  By 'low apparent cost', I'm suggesting management doesn't always 
notice man-hour costs, but that those costs are still significant.

> I use non-clustered LVM so that I can shut VM down (well, usually it's
> when the box is dead by itself :-)), dd it over and reboot. So there's
> a downtime during the transfer, which I thought acceptable.

  Are you using a remote (to the virtual machine host) LVM storage device?

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