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Slow disk-to-disk copy rates on all VM's in a Hyper-V 2008 failover cluster

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Hi,

I am getting very slow disk-to-disk copy times within my VM's.  This is just within the VM.  I can copy from a Hyper-V node to the shared storage, and copy times are ~300MB/sec.  For example, from the fixed D: drive on a VM to a fixed E: drive on the same VM, copy rates are ~12MB/sec.  Shared storage is an Equallogic SAN of 3xPS6100's.  Each node is configured with 2ea NIC's in the storage fabric (HIT kit installed), 1 management interface, and 1 network interface.  I have been here a year, but don't recall such slow copy times until I started troubleshooting SQL performance issues.

Any insight is appreciated.  Thanks.


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