High Disk Latency with Dell MD3200 Storage Controller

Hi.  I just wanted to pass along my experience that I had recently setting up shared storage using the Dell MD3200 SAS appliance.


VMware ESXi, 5.5.0, 1746974

Image Profile Dell-ESXi-5.5.0-1746974-A04

2 Dell T420 Hosts with 6Gps HBA SAS Controllers

1 MD3200 SAS appliance 4disk RAID 5 with hotspare


I was experiencing very high disk latency (~100-200ms) and couldn't understand why. My entire setup was HCL approved, etc.

Turns out the issue was with the mptsas driver version on the Dell image that I was using (see above specs). I reinstalled the host using VMware ESXi, 5.5.0, 2068190 with the Image Profile ESXi-5.5.0-20140902001-standard

The Dell driver was version and it sucked balls.

The vanilla driver from the stock Vmware image, version, worked like a charm.

I wanted to post this here in case anyone else had a similar setup.

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