Hi Everyone, I have a big issue and was hoping someone can shed some light. We have a dual controller MD3620i with 22 disks in one disk group running RAID 6. Drives are 900GB 10k RPM SAS. On top of this we created a single virtual disk with a little over 16TB of space. The SAN is directly attached to a Poweredge server running Server 2012 R2 using an Intel x540 dual port 10gbe network card. Port 0 on controller 1 connects to port 0 on the Intel NIC, port 0 on controller 2 connects to port 1 on the NIC, both connection use short CAT6a cables. The virtual disk was presented to the server using iSCSI initiators and MPIO is enabled. The virtual disk shows up as a 16TB D: drive on the windows server. The issue is, performance is terrible. Copying files from this volume we get 40MB/s, task manager shows active time to be almost 95% and average response time time for the disk at 500ms. During transfers our cpu spikes and we see System Interrupts using anywhere from 5-10% of cpu. With this many spindles we should be flying. The SAN and the Intel x540 both have the latest firmware and drivers. Any ideas? Thank you.
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