Changing SCSI Bus sharing mode from Physical to None

I need to make some configuration changes on one of the SCSI controller which has got 12 RDM attached into the Guest OS (Windows server 2003).

Does that cause any outage or drive letter change to the Operating system ?
what is the impact caused by doing this ?

Thanks.
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Senior IT System EngineerSenior Systems EngineerAsked:
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
To many any changes, to the virtual machine configuration, will require you to shutdown the virtual machine and make the changes. So scheduled downtime will be required.

But changes to the configuration, should not cause any OS issues.

However, before making any changes to any production VM, ensure you have a full VM backup, not a snapshot, mistakes can be made.
Senior IT System EngineerSenior Systems EngineerAuthor Commented:
Thanks for the reply,

in this case I cannot make any backup because the backup software failed to take snapshot of this VM (File Server).
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
You may want to check why, you cannot backup, RDM LUNs, could be the issue.
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Senior IT System EngineerSenior Systems EngineerAuthor Commented:
It is, but my concerns is about changing the scsi bus sharing type only ?

Downtime is fine for me, but what happened after I changed the scsi bus type ?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
No impact to the VM. Often clustered nodes require physical.

Physical - Virtual disks can be shared by virtual machines on any server.

None - Virtual disks cannot be shared by other virtual machines.

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compdigit44Commented:
If you don't mine me asking what is causing you to change you SCSI mode?  have you check to make sure the mode you are changing to is support by your SAN?
Senior IT System EngineerSenior Systems EngineerAuthor Commented:
comp,

THe reason is that the VM was provisioned wrongly :-) a simple mouse click on the "physical" mode prevents the Snapshot of C: drive and also DRS and VMotion.
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