win2008R2 : virtio-blk : bsod on boot disk live block_resize about kvm-guest-drivers-windows

[YanVugenfirer]

Hi,

Thanks! We will look into it.

Best regards,
Yan.

On Wed, Feb 20, 2013 at 5:17 PM, aderumier [email protected] wrote:

Hi,
I'm trying to resize (extend) a boot disk (c:) on win2008R2 with
virtio-blk disk, with qmp block_resize.
qemu 1.4 / drivers build 52

I got bsod, I can reproduce 100%.

It's working fine with resize of a non boot device (d:).
It's working fine with virtio-iscsi disk boot device.

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Reply to this email directly or view it on GitHubhttps://github.com/YanVugenfirer/kvm-guest-drivers-windows/issues/9.

[vrozenfe]

You cannot do it on a boot disk. On-line resizing works for non-system disks only.
Kind regards,
Vadim.

[aderumier]

Hi Vadim

You cannot do it on a boot disk. On-line resizing works for non-system disks only.

So, Why does it work with virtio-scsi ?
Is it a limitation of virtio-blk + windows ?
It's also working fine on linux root disk

[vrozenfe]

On 21/02/2013, at 4:18 PM, aderumier [email protected] wrote:

Hi Vadim

You cannot do it on a boot disk. On-line resizing works for non-system disks only.

So, Why does it work with virtio-scsi ?

In Windows?
Is it a limitation of virtio-blk + windows ?

I need to initiate the bus reset sequence in order
to make on-line resizing working. From the system point of view
it looks like we eject disk, change some fields in disk description and
then re-inject the disk back. System just cannot survive such
sequence on a system disk.
It's also working fine on linux root disk

It probably can be done in Windows also. But we will need
some sort of file system filter to make it working.

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[aderumier]

So, Why does it work with virtio-scsi ?

In Windows?
Yes, reisze boot disk with virtio-scsi in windows works fine.
Note, that I think that the difference, is that with virtio-iscsi I need to click on rescan disk in windows disk manager.
So maybe this is why it's working fine ?

I need to initiate the bus reset sequence in order
to make on-line resizing working. From the system point of view
it looks like we eject disk, change some fields in disk description and
then re-inject the disk back. System just cannot survive such
sequence on a system disk.
ok, thanks for the explain !

[vrozenfe]

On 22/02/2013, at 3:55 PM, aderumier [email protected] wrote:

So, Why does it work with virtio-scsi ?

In Windows?
Yes, reisze boot disk with virtio-scsi in windows works fine.
Note, that I think that the difference, is that with virtio-iscsi I need to click on rescan disk in windows disk manager.
So maybe this is why it's working fine ?

Yes, It might work for iscsi. Because this feature has not been implemented yet for the
"norma" Windows virtio-scsi.
Best regards,
Vadim.

I need to initiate the bus reset sequence in order
to make on-line resizing working. From the system point of view
it looks like we eject disk, change some fields in disk description and
then re-inject the disk back. System just cannot survive such
sequence on a system disk.
ok, thanks for the explain !

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