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How do I attach multiple shared disks in vm cluster when a disk device ID is limited to 0 an a shared SCSI controller?

Posted on 2008-11-02
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Last Modified: 2012-05-05
While trying to add additional shared disk resource to existing MS cluster in Virtual Server 2005, I noticed that on a shared SCSI controller the only selectable option when adding a disk is ID 0. If the controller already has a disk with ID0 (as in quorum in this example), it not possible to add any further shared disks to the shared bus.
e.g. The virtual machine has two SCSI adapters. The Shared controller is attached as Virtual SCSI adapter 2 (SCSI adapter ID: 7). On the Virtual Hard Disk Properties page, clicking the attachment drop down only lists ID 0 for SCSI 1. The non shared adapter has ID 0 through 7 available for selection.
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Question by:MyChris
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by:MyChris
ID: 22860974
I have since added multiple SCSI controllers, one for each of the shared disks. Why the restriction - is it specific to MVS? Normal practise in a physical configuration? Do other virtualisation packages have the same restriction?
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brent_caskey earned 500 total points
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Hello MyChris,

To my knowledge, this is just a Virtual Server quirck. This is not normal practice with hardware SCSI clusters. I have worked on many SCSI clusters where you have one controller in each server and multiple volumes / virtual disks on the array.

Here is the walkthrough on how to create a guest cluster in Virtual Server 2005 in case you run accross anything else: http://www.microsoft.com/technet/prodtechnol/virtualserver/deploy/cvs2005.mspx (Although, this exact issue is not covered).

Regards,
brent_caskey
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