ESXi 5.0 error

I am getting the following error:

Device naa.6001e4f01260e5000f39a53f0c46d8a2
performance has deteriorated. I/O latency
increased from average value of 3605
microseconds to 109102 microseconds.
9/13/2013 10:38:52 AM

The problem comes and goes and I am suspecting the drives are an issue.  They are 500gb sata raid 5.

We have about 10 VM's running all the time and they are always online.  I wanted to get some advice on an approach to rectify the problem.  The server is 6 years old and I was thinking of requesting a new one to migrate the VM's over time to utilize the old server elsewhere.  I have noticed the ESX could be upgraded but if it goes south during an upgrade we have a lot which needs to be moved and we are now in a crisis situation.

What is truly the problem if it was working correctly in the past?  What could be causing the IO latency?
Who is Participating?
Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Yes, very normal, for an under performing datastore.

1. Check if any virtual machines have snapshot disks.

otherwise, it's possible you have just maxed out this server.

Are these SATA 7200rpm disks, and how many in RAID 5?

But despite the error, any performance issues noticed?

see my EE Article

HOW TO:  Performance Monitor vSphere 4.x or 5.0
compdigit44Connect With a Mentor Commented:
I agree with Hanccocka, is sounds like your local storage is maxed out on IOPS. Also different types of RAIDS and also affect performace. For you new server I would suggest to try to calculate your current IOPS and then estimate for future growth IOPS.

You many want to look into a small SAN as well.
SquidsupportAuthor Commented:
LOL I have tried to get a san that isnt going to work they dont want to pay the price for overhead.

Thank You both.
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