Poor with RDM only when added to the CAB MSCS cluster performance

Hey guys, thanks for taking a peek at this question... I'm looking for some ideas.

I have 2 virtual machines running Windows 2008R2.  They put MSCS in place and works as a taxi (cluster across boxes).  I use a 7500 VNX, fiber channel and RDM physical drives.  Is on an 8 node ESXI 5.1 v1117900 implemented.  Functionally, everything works fine.

The problem is that the performance is very poor on only the RDM that have been added to the MSCS cluster.  I can take the same drive, remove the cluster, run IOmeter and it's fast.  I add to the cluster, MSCS, leaving in storage, and it is 1/15th the IOPS performance / s.  Remove the drive of MSCS and it goes back to when you run as usual.

I tried different controllers SCSI (LSI Logic SAS vs Paravirtual) and it doesn't seem to make a difference.  I have physical MSCS clusters that do not seem to present this kind of performance problem, so I wonder if it was not something goofy with the MSCS on the configuration of virtual machines.

I've already implemented in this article: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US & cmd = displayKC & externalId = 1016106

I saw this poor bus rescan the performance issue until I put the RDM perpetually booked, but it was not a problem since I implemented the fix.

For any help or suggestion is appreciated...

Thank you

-dave

Recently, I upgraded my esxi from 5.0 to 5.1 environment and have a bunch of systems with RDM. I had a problem as well. What I found, was that during the upgrade it changed all the policies of path to the LUN and rdm, it's the turn of robin. This causes a huge performance issue in my environment. I changed all the paths to MRU and it solved the problem.

Tags: VMware

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