Need Help Troubleshooting Disk I/O Performance Please..

[tscott2340]

I'm running ESXi 4.1. I have, what I believe to be, a disk I/O issue.. I have an EMC AX4-5i with two hosts.. Trying to do a storage vmotion (with the VM powered off) took over an hour before it would actually show the progress of 1%.. I had to cancel it..

Powering on a VM took over 3 minutes to login (and it was a fresh VM from template)..

Trying to install Veeam on a VM took over 60 minutes to get past the "analyzing" part..

Today I was copying files from VM to VM and while running esxtop the DAVG/cmd was over 3,000 on one of the hosts.. One of the VMs lived on host A and the other lived on host B.. Host B's esxtop DAVG/cmd didn't go over 100..

One thing to note is that the AX4's write cache is currently disabled because of a bad SPS.. I just don't know if that can cause such severe performance degradation..

Any help would be appreciated.

Thanks

[memaad]

Hi,

Disabling cache could cause performance issue. However you can check the vmekrnel logs for more information to see if anything else is causing the problem.

Regards

Mohammed

[admin]

Yes Enable cache.. It would improve the performance... AX4-5i should be using iSCSI. If yes recommend enabling jumbo frames as well...