[DRBD-user] DRBD, Xen, HVM and live migration

Mark Deneen mdeneen at gmail.com
Fri Sep 23 18:29:26 CEST 2011


On Fri, Sep 23, 2011 at 7:03 AM, Felix Frank <ff at mpexnet.de> wrote:
> On 09/23/2011 12:49 PM, Arnold Krille wrote:
>> And if there is a penalty for using image-files for the vm, I haven't
>> encountered any.
>
> That's literally the first time I hear someone make this statement, ever.
>
> But then, I never did any benchmarks myself and have to rely on heresay.
>
> Still, depending on your workload, I can see no reason why direct disk
> access shouldn't have (at least potential) performance advantages.
> Furthermore, I see little benefit in image files (in the OP's scenario,
> who isn't gunning for a 4+ node cluster).
>
> Still, your cluster sketch is quite intriguing.
>

I didn't analyze it much, but with our hardware here I found little
performance difference between partition based and file based VM
storage.  Ours are exported over iscsi-scst if that makes a
difference.

Depending on the use, the file based VM can be much more convenient,
especially for backups.

-M


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