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High DAVG Values in rather small environment

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Hello Everyone,

 

I'm looking if I can get some advice from your group on how to handle a rather frustrating situation.

 

In one of my branch offices, I have a rather small VMWare ESXi 4.1 environment running on two IBM HS22 Hosts.  The hosts are running on BladeCenter S storage. 

 

In the last few months, I have been getting horrible performance from a majority of the VM's that are running on those hosts and I am out of ideas on how to prove what is causing the issues.  I am starting to think that it is storage related, but I am having trouble coming up with an argument which will support my theory.

 

Here is the info on our system:

  • There are 6 shared datastores on each host.
  • There are two storage pools in the BladeCenter S. 
  • One storage pool contains Five 15k 420 GB SAS disk, the other contains Five 7.2k 2 TB SAS disks.
  • Both Pools are configured in individual RAID5 arrays

 

When i have ESXTOP open, I can see that the DAVG/cmd value is often jumping from 68-620.  I even saw it jump to 1887 at one point.

Looking at the Performance Tab in the vSphere client for each host, in the last 1 hour, I have a max of 476 ms write and 114 ms read latency on the storage adapters for one host, 74 write/34 read for the other host.

Also looking at the Performance Tab in the vSphere client for each host, in the last 1 hour, I have around a max of 383ms write/406ms read latency on two of the datastores for one host, 266ms write/527ms read latency for the same two datastores on the other host.


I am not seeing this issue on other hosts running on different storage in a different geographic location.


I have attached screenshots of the performance I am seeing.


What are your recommendations on how to proceed with troubleshooting the source of the performance issues on these hosts?

 

Thanks in advance for your help.

 

-Sean


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