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Difference between SCSI and IDE Virtual Disk Type

Posted on 2007-03-17
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When creating a virtual disk type in VMWare Server it ask to choose between type SCSI and IDE.  Since it's a virtual disk how does my choice make a difference, what factors should i consider when trying to decided?
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Question by:menreeq
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rvthost earned 500 total points
ID: 18740394
Came across this previous post in VMTN that may be helpful in your decision:

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> I'd still be interested to know if there are any real
> advantages to using SCSI over IDE.

That's going to depend on a few things:

- Do you plan to migrate the VM to ESX at any time? If so, then you should use SCSI since ESX does not support IDE disks.

- Does your guest OS have SCSI optimized drivers? The SCSI command set is much more intelligent than the IDE command set. It supports command chaining and other advanced features. If your guest OS includes "more intelligent" SCSI drivers, then you may get better performance from a SCSI virtual disk than from an IDE virtual disk.
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by:menreeq
ID: 18740400
Good post, sounds like i should choose SCSI as it appears to give me more options and possible performance increases in the future, agree?
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by:rvthost
ID: 18740411
I would certainly agree with that!  I use SCSI virtual disks for all of mine :)
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