Comments on: VMDirectPath? Paravirtual SCSI? – vSphere VM Options and You!

By: Section_32

Section_32 — Thu, 26 Jan 2012 19:23:00 +0000

I know this is quite an old article but i was wondering, why not use PVSCSI all the time on all the VMs? If it’s better then is there a reason not to?

By: VMWare ESX, storage over 2TB - Admins Goodies

VMWare ESX, storage over 2TB - Admins Goodies — Sat, 20 Aug 2011 16:24:47 +0000

[...] http://professionalvmware.com/2009/08/vmdirectpath-paravirtual-scsi-vsphere-vm-options-and-you/ [...]

By: professionalvmware

professionalvmware — Sat, 18 Jun 2011 12:53:00 +0000

From the sound of it you’re wanting to do this under VMware workstation or
similar hosted virtualization product. At this time I believe DirectPathIO
and Paravirt SCSI only work on the vSphere products (ESX Classic and ESXi),
and even then only for boards that are on the HCL. If your hardware supports
ESXi I’d say set that up with two XP VMs running on top as a test. That
said, you’d no longer have a gui to manage the box directly and would need
to remote manage from another workstation.

By: Justin

Justin — Sat, 18 Jun 2011 05:21:00 +0000

I’m actually looking at this functionality for a completely different reason. I used to be in IT, so I kind of shudder when I run into someone who has no clue.

I operate very specialized analytical equipment that is integrated heavily into the PC environment. Unfortunately, the hardware is much more complicated than, say, a scanner (Or even SAN arrays, for that matter), and it is not mainstream, so driver development is virtually non-existent. As a result, I have once PC that has two PCI cards in it. One is a high end data capture board, the other is a multi-channel analyzer.

Both of these boards were supported perfectly under Windows XP, and they kind of work in Windows 7 32 bit, but one of them (The multichannel analyzer) takes up a HUGE amount of memory, so both do not function well together on Windows 7, and don’t even get me started on my efforts to get them running under 64 bit…

The XP driver had all sorts of nice features which made it so that the card only used up additional memory when it was actually being used. This feature allowed me to use the full amount of RAM when the card was dormant. That feature no longer works in Windows 7.

Back to the IT department. They decided to revoke all support for XP machines, and try as I might, they don’t see any reason to keep this machine running XP. It must be upgraded. So…

My thought is to install VMware and run two virtual machines- the CPU will support it, and if I can make 32 bit VMs on a 64 bit Windows base, then I can allocate memory between the to. (Machine currently has 8GB, I can make it 16 with no problems…)

The only issue is the pesky PCI cards. Will the DirectPath I/O allow me to link one card to one VM and run it in an XP 32-bit environment under Windows 7 64 bit?

By: VMWare ESX, storage over 2TB

VMWare ESX, storage over 2TB — Sun, 28 Nov 2010 12:24:27 +0000

[...] http://professionalvmware.com/2009/08/vmdirectpath-paravirtual-scsi-vsphere-vm-options-and-you/ [...]

By: Nitin

Nitin — Thu, 30 Sep 2010 05:03:00 +0000

That the best explaination I ever saw. Thank you so much!. Answered all my questions so far.

In fact we are looking to vertualise SAP servers and as discussed databases require high I/O. I there an alternative option to use Pass through and V motion both at the same time or if not the same thing but a similar solution?

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By: VCP4 Online Study Group Follow-Up

VCP4 Online Study Group Follow-Up — Fri, 18 Dec 2009 14:03:56 +0000

[...] Direct Path IO [...]

By: renecarrier

renecarrier — Thu, 01 Oct 2009 20:32:35 +0000

Helpful with a bit of humor. It was pleasant to read.
Good overview article.

By: renecarrier

renecarrier — Thu, 01 Oct 2009 15:32:35 +0000

Helpful with a bit of humor. It was pleasant to read.
Good overview article.