Re: [Xen-devel] Writing a tool for Shared Persistent Windows Boot Image

["Jim Burnes" <jvburnes@xxxxxxxxx>]

Alan, thanks for your comment.   Sorry the reply too so long.   I believe that primitive support for dom0 is available.

So far I've been able to implement persistent copy-on-write snapshots with LVM snapshotting, however that method seems to consume way to too much main memory.  We're limited to about 7 VMs of 256M of memory each.  I'm trying to fit about 12 VMs on our 4 GB test box.

To achieve that we'll probably have to move over to qcow copy-on-write files.  They seem to be the ideal way to implement our solution, however I've had the devil's own time getting them to work.  I created the required qcow image files and updated my configuration, but 'xm create <vmname>' just runs and the VM immediately quits with no debugging information.

I'm wondering whether (1) I've screwed up the qcow images or (2) I'm using a set of RPMs that don't support tap:qcow (using 3.1 RPMS from XenSource) or (3) The default RHEL 5 Xen kernel doesn't include TAP support.

Jim Burnes
Boulder, CO


I'd like to use qcow files, since they seem to do

On 6/21/07, Alan Cox < alan@xxxxxxxxxxxxxxxxxxx> wrote:

> Is this supported natively in Xen?  What does everyone else who needs
> to run a lot of Windows VMs do?  There must be a way to support
> shared images.

The Linux dom0 kernel has some snapshotting support which seems to be
what you are asking for ?

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