libvirt users - Apr 2018 - Possible to resize a Windows guest's disk while online?

I'm looking for a way to online resize a Windows disk -- i.e., be able 
to resize the disk without shutting down, rebooting, or detaching the 
disk.

Is this at all possible?  Or am I just barking up the wrong tree?  I'm 
not finding a way to do this and even Amazon has a weird workaround, in 
which the user must write data to the newly resized-drive in order to 
recognize the new size without taking the disk or the VM offline.

[Obligatory] YAY Microsoft.


-- 
Andre Goree
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Email     - andre at drenet.net
Website   - http://blog.drenet.net
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On Wed, Apr 11, 2018 at 01:30:26PM -0400, Andre Goree
wrote:
>I'm looking for a way to online resize a Windows disk -- i.e., be able
>to resize the disk without shutting down, rebooting, or detaching the
>disk.
>
virsh blockresize $domain $disk $size

and then resize the disk in the disk managing utility inside the guest.  I
don't
thinkg qemu-guest-agent can do that for you.
>Is this at all possible?  Or am I just barking up the wrong tree?  I'm
>not finding a way to do this and even Amazon has a weird workaround, in
>which the user must write data to the newly resized-drive in order to
>recognize the new size without taking the disk or the VM offline.
>
>[Obligatory] YAY Microsoft.
>
>
>-- 
>Andre Goree
>-=-=-=-=-=-
>Email     - andre at drenet.net
>Website   - http://blog.drenet.net
>PGP key   - http://www.drenet.net/pubkey.html
>-=-=-=-=-=-
>
>_______________________________________________
>libvirt-users mailing list
>libvirt-users@redhat.com
>https://www.redhat.com/mailman/listinfo/libvirt-users

On 2018/04/17 9:56 am, Martin Kletzander wrote:
> On Wed, Apr 11, 2018 at 01:30:26PM -0400, Andre Goree wrote:
>> I'm looking for a way to online resize a Windows disk -- i.e., be
able
>> to resize the disk without shutting down, rebooting, or detaching the
>> disk.
>> 
> 
> virsh blockresize $domain $disk $size
> 
> and then resize the disk in the disk managing utility inside the guest. 
>  I don't
> thinkg qemu-guest-agent can do that for you.
> 
Thanks, yeah this was actually more a question about the Windows guest 
specifically, which I suppose should not have been answered on this list 
haha.

Just thought that maybe I'm not the only one who's ever tried to resize 
an RBD disk (didn't mention Ceph in my OP) while it was still attached 
to a Windows Server 2016, and have that guest immediately realize the 
additional disk space -- even if necessary to use Disk Management > 
Action > Rescan Disks (which works on 2k8 & 2k12, but does nothing on 
2k16).  Frustration ensues, lel


-- 
Andre Goree
-=-=-=-=-=-
Email     - andre at drenet.net
Website   - http://blog.drenet.net
PGP key   - http://www.drenet.net/pubkey.html
-=-=-=-=-=-