Comments on: VMware pvSCSI – When and when not to use it

By: Section_32

Section_32 — Mon, 30 Jan 2012 15:22:00 +0000

HI
Now a year has moved on, do we know if 4.0 U4 has the same fix as 4.1?

By: Matt Ray

Matt Ray — Tue, 23 Nov 2010 15:52:00 +0000

Hi, note that this issue is now fixed in vSphere 4.1, so you can use PVSCSI for any workload.

By: scottsauer

scottsauer — Mon, 08 Feb 2010 18:37:40 +0000

Thanks for the link Didier! Yes this breaks the traditional expected IOPS for any virtual machine, I would say once you get into several hundred iops per vm, you need to shift your thinking about your storage configuration. You could easily begin to impact your other virtual machines that share that same data store.

By: PiroNet

PiroNet — Mon, 08 Feb 2010 14:39:31 +0000

Hi Scott,
2000 IOPS it's definitely a lot for a single VM!

>Consider this, a standard fiber channel 10,000 RPM drive averages around 125 IOPS per disk.
Here is a formula to easily calculate the IOPS of any disk: 1/(average latency in ms + average seek time for read or write in ms)

More at http://deinoscloud.wordpress.com/2009/09/11/und…

Cheers,
Didier

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By: Tim Oudin

Tim Oudin — Sat, 06 Feb 2010 05:50:52 +0000

Great, and quick, follow up Scott!

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