I use OpenStack to spawn virtual servers. I launched a new virtual server that runs on Microsoft Windows 10. Afterward, I attach to it 300GB of extra storage space, in the shape of a Red Hat VirtIO SCSI Disk Device. How can I extend the system partition in Windows 10 with a Red Hat VirtIO SCSI Disk Device?

When I go to the Disk Management in the virtual server running Microsoft Windows 10, I see:

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where Disk 2 is the Red Hat VirtIO SCSI Disk Device.

The Extend Volumeoption on Disk 0 is greyed out:

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your disks are dynamic which means volume can't go behind disk limit.

Make disks dynamic first then you should be able to extend it.

  • With this additional side-note: The extra disk must be visible to the Bios or UEFI at boot-time. If it is NOT visible there (AKA needs a driver in Windows for it to be accessible) you can't extend the OS partition to it. If it can be accessed by a UEFI driver that is loaded by UEFI before Windows is started it should also be possible to use as part of the system drive. I have never seen that working, or even heard of someone who tried it, but in theory it should be possible.
    – Tonny
    May 21 '18 at 11:34

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