VMware vSphere 4 SCSI controller type

I have just installed VMware vSphere and have a question about SCSI controller types for the guest OS.  The choices are:

BusLogic Parallel
LSI Logic Parallel
LSI Logic SAS
VMware Paravirtual

I'd like to install Windows Server 2003.  Is there any advantage to installing one over another?  Where do I get the drivers for them?
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amaru21Asked:
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EnphuegoCommented:
Windows 2003 should already have the drivers built in.

I can't tell you the specifics about the SCSI controllers, looks like there are some new options for version 4.
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za_mkhIT ManagerCommented:
If you want a trouble free setup, go with LSI Logic Parallel.
The LSI logic SAS and VMWare PV SCSI driver are new to vSphere. The VMWare PVSCSI driver will result in lower CPU usage in the Guest including slightly better performance.
In fact VMWare recommends that you configure your system drive to use the LSI logic SCSI adaptor (parallel or SAS) and then add another SCSI controller to your VM but choose this to be the PVSCSI controller. On this controller you attach a drive which will host all your data.
I tried doing that yesterday, and couldn't add two different SCSI adaptors to my guest on a vSphere 4 ESX server.
I recommend for the time being, just stick to the LSI Logic Parallel driver. Windows 2003 has built in support for that so no needing to press F6 to install another driver.
 
Hope this helps
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davismisbehavisCommented:
Just to back up what za_mkh wrote.  the ParaVirtualised Adapter would be used for data drives,  the boot OS cannot be a PVSCSI adapter.  I too have yet to work out how to add 2 different SCSI adapters to the one VM,  something I'm going to find the answer to today if I can.

The new VMware Paravirtual adapter is the new vSphere adapter that is driving most of vSphere's massive I/O improvements.  This is only supported on certain Operating Systems,  Windows 2003 is one of these OS's.

I recently wrote a blog post about what's new in vSphere storage where I explain a little about the para virtualised SCSI and include some links to the VMware white paper and an article on the performance benefits by Chad Sakac at EMC

http://www.virtualpro.co.uk/2009/05/17/vsphere-40-whats-new-in-vsphere-storage/

Enjoy, www.virtualpro.co.uk 
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amaru21Author Commented:
I would like to thank all three of you for your help.  I asked the same question to VMware technical support and basically got the same answer.  They said to use the LSI.
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EnphuegoCommented:
Nice link, I found it very useful.
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1ParkplaceCommented:
Hey za_mkh,

Wanted to help you out.  You add a second SCSI adapter by changing one of your drives Virtual Device Node ID to 1:0, you will see it adds another adapter, at that point you change the type to VMWare Paravirtual.  You can have up to 4 SCSI adapters per vm, 0:0, 1:0, 2:0, 3:0.

As well, when you boot the OS, the guest disks are not visible, you have to go to Disk Management and "Reactivate Disk" in order to get them back.

Good Luck.
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za_mkhIT ManagerCommented:
Hi 1Parkplace,
Thanks for updating this thread. Sure it would be handy for others!
I found that out on the weekend on some other forum  - but forgot to update this thread ;-}
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BrentDevOpsCommented:
I just upgraded to vsphere and i am still wondering if SAS or parrallel would be faster.  That article on the Paravirtual is great, i am going to be using that for my all my data drives from now on.  Has anyone changed storage from LSI to Paravirtual?
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