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VMware VM device node type (IDE vs SCSI)

Posted on 2012-03-12
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Can anyone tell me if there is a performance difference between creating a VMDK as an IDE or SCSI device?

Thanks
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Question by:MMRNLA
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LVL 119
ID: 37710656
Yes, use SCSI, and LSI at that!
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Assisted Solution

by:coolsport00
coolsport00 earned 250 total points
ID: 37710668
Yes; and if you use IDE you run the risk of not being able to modify the VMDK (i.e. increase the size) as needed.

~coolsport00
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Expert Comment

by:dlethe
ID: 37710673
Hanccocka beat me to it, hands down, SCSI. End of discussion, award points to him, and move on.
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by:MMRNLA
ID: 37710676
Would it be comparable to physcial differences in regards to IDE vs SCSI?

I can't seem to find anything online regarding the actual differences.
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LVL 119
ID: 37710692
Yes, but IDE also causes more overhead on the host.
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LVL 119
ID: 37710696
IDE, was only provided recently for backward compatibility purposes. Use SCSI.
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Author Comment

by:MMRNLA
ID: 37710706
My issue is that I was provided a template for a Sharepoint 2010 app server. This template was set as "Other". So the default disk type was IDE. Not good when all of your SharePoint servers are spinning on IDE with no ability to resize.

thanks guys.
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Expert Comment

by:coolsport00
ID: 37710722
You can convert to SCSI (see this KB: http://kb.vmware.com/kb/1016192), but it's a bit intricate. Your best bet to convert the disk is do a V2V using Converter Standalone. You have the option, during the conversion wizard, to modify the disk controller type.

~coolsport00
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 250 total points
ID: 37710829
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Author Closing Comment

by:MMRNLA
ID: 37712672
as usual, thanks guys
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