[Qemu-discuss] Windows marks read-only disks as failed

[Tomáš Vondra]

Hi!

We have a public OpenStack cloud and on it a backup and restore service for 
Linux, which mounts virtual disk snapshots read-only. We wanted to use the same 
for Windows.

When Windows is presented with a hot-plugged virtio-scsi device which is 
read-only, it marks it as failed, doesn't show any partitions, doesn't allow to 
online it, and of course cannot clear the read-only flag, as most articles on 
the 'net suggest.

Any tips to make this work? Or is there and inherent limitation of Windows or 
the Windows virtio drivers so it won't work no matter what we do?

Thanks, Tomas, homeatcloud.cz