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VMWare Poor Performance On 2 DL380 G5 with MSA500 G2 Storage

I am currently in the process of building out a VMWare cluster using two DL380 G5 and a MSA500 G2 for the storage. When testing out performance we are running into a problem when both DL380s are powered on and connected to the MSA500. For some reason when both DL380s are conncted to the MSA500 we get very poor performance when running a performance test from one of our custom applications through a VM. This problem occurs regardless of which server that the VM is ran on. When I shut down one of the DL380s and run the performance test again, we get decent performance out of the MSA500. I have tested this out on both of the servers and the good performance will happen as long as the other server is shut down.

I know that the MSA500 is not in the supported hardware list, but we should still get decent performance out of the MSA500 when both servers running off of it.

Anyone have any ideas?
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I am looking at taking two DL380 G4 NW65 cluster servers with a MSA1000 and build a VMware cluster by the end of May. I will be very interested in your results.
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It looks like that I managed to get the MSA500 G2 working while both servers are powered on. I am also able to power down a VM, move it to a different server on the cluster, and turn it back on. This will perform at acceptable rates.

 I am now having a problem transferring a VM between machines while the VM is powered on. When I switch the VM to a different node and try and run a performance test, it does not perform as it should. The VM will stay unresponsive until I fully power the VM off and back on.

Does anyone have any experience with this?
Try removing any HP monitoring software from the servers if it is installed, I heard that it could cause problems with the Service Console. Also how many NIC ports do you have? I would try at minimum to have 4 per server, 1 for vmotion, 1 for the service console, and the rest for the VM's to use. Hope this helps

Where do I go to remove the HP monitoring software?
Are you running ESX server, and if so, what version?
We are running 2 ESX server nodes, and we are running version 3.5.

Is it possible that the storage drivers need to be updated or something like that?
I looked in the VMWare forums, and saw that someone got this working using SSP (Shared Storage Presentation). I forgot that the msa500 is shared SCSI, which could cause lockups when more then one server is trying to access the same LUNS. Use the HP Array Configuration Utility, and setup SSP so that both servers can access the drives. Make sure that you have a GOOD BACKUP, since I do not know how SSP is going to react in a Shared SCSI environment.
We do have the array setup so it is using SSP, so I don't think that's the problem.
I have an older msa500, but I cannot get on it because it is being used right now. It does sound like a SCSI issue, and with the amount of movement that vmware allows the vm's on esx, I can see the possibility of having problems when using scsi.

How is you SSP currently setup?
We have three different logical drives on the array and each server is allowed access to all three logical drives in the SSP screen
Good Morning to everybody

I've necessity to understand how mlptechnical have solved the performance problem using MSA500 G2.

Infact I have the same configuration as him (VMWare cluster using two DL380 G5 and a MSA500 G2 for the storage; 2 ESX server nodes,  running VMW Infr. version 3.5.) and we will decide to buy the license for 30000,00¬  for the VMware Infrastructure ESX 3.5, but the initial post have frightened me!!!

Thanks for your answered.

Have a nice day.
Was this ever solved? I am in a similar situation with the same hardware. Has anyone got vMotion working properly with an MSA500G2 connected to multiple servers as shared SCSI? How is SSP set up?
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That's great advice, thanks very much.