I have 1 ESX server and 1 ESXi server both running vSPHERE 4.0. No vCenter. I introduced a SAN (Drobo B800i) along with a Cisco 3760G, and Dedicated NIC cards. I migrated some servers and the performance is unusable. Especially Exchange. Exchange is a 250GB file. It took 7 hours to perform a cold copy over to SAN. When I copy back over to local storage It is taking up to 20 hours. I have both VMWARE and DROBO cases open. VMWARE support is stating that there is excessive latency on the SAN. I have jumbo frames and flow control enabled. I can ping using jumbo frames. What could be possibly be bringing this SAN to its knees?
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