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Extend Pass-through physical disks in Hyper-v Virtual machines

Posted by Brajesh Panda on April 20, 2011

I have a virtual machine allocated with a pass-through physical disk. I like to extend the size. How to do??

In below screen shot Disk 0 & Disk 1 both are pass-through disks. These two are two SAN Luns allocated to my Hyper-v hosts. Disk 0 pass-through disk is used for operating system & Disk 1 is used for data.

In normal circumstances if we extend the local drive or SAN LUN & we do a Disk SCAN in the operating system. After that disk management usually show us new free new space available for extension.

In case pass-through disks you will able to see new size from virtual machine settings. But virtual machine operating system will not able to see the extension free space in the pass-through drive. You have to reboot the virtual machine to see the extension.

In my lab I have extended the 9GB LUN to 19GB. Here is the screen shot of virtual machine settings

 

After VM reboot you will able to see the free space on Disk 1. Now you can extend the same.

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3 Responses to “Extend Pass-through physical disks in Hyper-v Virtual machines”

  1. Rene Tap said

    You have to reboot the virtual machine to see the extension

    Just choose “Rescan Disks”

  2. someone said

    Not 100% sure but.. judging by the picture you pass through disk is attached using the IDE controller. If you had the disk attached using the SCSI controller you would be able to see the free space without rebooting the VM.

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