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

Felix Frank ff at mpexnet.de
Fri Sep 23 18:34:35 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On 09/23/2011 06:29 PM, Mark Deneen wrote:
> 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.

I believe it does.

If your VMs use iSCSI bases storage, the network is likely your
bottleneck (does iSCSI support Infiniband?).

When your VM sits directly atop DRBD, hopefully your disks are the
bottleneck. Image based virtual disks add a layer of indirection, as the
host system needs to handle the file operations.

Again, for some workloads, this may not be much of an issue.


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