iSCSI SAN RAID 10 Performance -- Poor Read, Good Write

Posted by Litzner on Server Fault See other posts from Server Fault or by Litzner
Published on 2014-08-24T22:57:45Z Indexed on 2014/08/25 16:22 UTC
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vmware-esxi

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san

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iscsi

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dell-equallogic

I have a EqualLogic PS4000 SAN unit with the latest firmware, setup in RAID 10. I have 3 2TB Volumes on the SAN shared out via iSCSI on 2 eth ports on two different subnets. I have moved a test server over to this newly setup SAN, and my testing is showing me a problem.

I am getting dismal read performance in everything except a test with 32 queue depth (see attach image)

enter image description here

Write performance seems to be right about where it should be.

I have tried MPIO on and off, on was slightly better but not much.

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