Lost SCSI VHD disk on an SBS 2008 VM client on a Hyper-v r2 server

Posted on 2012-08-10
Last Modified: 2012-08-12
Hi, I recently migrated a physical SBS 2008 premium server to a virtual machine on hyper-v core server r2, without much problem using Double take move, but after few days, I rebooted the vm machine and the scsi disk d (near 2tb volume) did not show up. The lost volume seams to be ok on the host machine, but on the client sbs 2008 vm it does not appear on disk manager.

Any idea how to troubleshot this?

Question by:munirb14
    LVL 38

    Expert Comment

    by:Philip Elder
    Where is that 2TB hosted?

    Internal RAID array? External USB/eSATA device?

    As a rule _all_ production VM VHDs should be hooked up via IDE Bus.

    That leaves us the following scenario depending on backup used:
    IDE0-0: VM OS Partition
    IDE0-1: VM Data Partition
    IDE1-0: Optical/ISO
    IDE1-1: FREE (needed to attach VHD for recovery!)

    SCSI: Used for hot swap capable VHDs for things like backup destinations (we use this bus strictly for that only).


    Author Comment

    hi Philip,

    The 2tb is hosted on a vm scsi 0, which is on a C: drive on the Hyper-v server (dell perc with raid 10)

    Could I change the vhd from scsi virtual bus to an virtual ide?
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    is it connected to the vm?

    does it appear in Disk Management?

    if so Backup now before any modification, checking....

    Author Comment

    It is connected to the VM.

    It does not appear on disk management of the vm client

    it is backed up
    LVL 38

    Accepted Solution

    Make sure your backups are good (host and guest).

    Then switch the VHD over to IDE.

    NOTE: You may need to boot to Safe Mode to change the drive letter assigned to that VHD back to what it was after the switch and then reboot into the OS.


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