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HyperV 2012 Slow read access

Posted on 2014-09-03
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Hi,

We have a HP DL 360P G8 with 96 Gig ram, the server runs 2012 server with the hyperv role installed, there are 6 vm's installed these are all located on a Netgear Ready Nas 3200 with a single iscsi lun connected to the server.

HyperV is setup with a single virtual switch connected to a single nic on the server, we have issues with read speed when accessing data on shares that are on the vm's but not when accessing shares that are on the iscsi but shared off the physical host server.

Thanks,
Craig
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Question by:NSSUK
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Expert Comment

by:Cliff Galiher
ID: 40301276
Well, with a shared NIC. accessing a share on a VM will basically be funneling traffic through the NIC twice. You are taking a 50% network performance hit right there. It is a limitation of the network architecture you have.
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by:NSSUK
ID: 40301320
Hi Cliff,

Ok the server does have 4 nic's in total so could we do something there, i dont understand the virtual switch in hyperv so may not explain myself correctly.

Also the nic that is assigned to the virtual switch says it has a connection speed of 10Gig but is only a 1gig card
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Cliff Galiher earned 2000 total points
ID: 40301333
You explained yourself fine. If you have more NICs then yes, you have options. Ideally all iSCSI traffic would have its own network. That means its own switch and its own NICs on both ends of the connection. That would help alleviate a network bottleneck, although at 1G, you will still have one.

As far as the 10G, that is normal and expected.
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