Hello,   Anything related around performance issues is very difficult to triage without being able to gather diagnostic info.  I would suggest you open a support case.  On the LUN affected is there actually a performance issue or just the load shown in SANHQ?    What EQL firmware are you using and what version of SANHQ?    Regards, Don  
Hi. I have a EQL group (3 members) hosting LUNs that are used in Hyper-V clusters as CSVs. One of these LUNs reports (SANHQ) higher than expected avg, disk queue length - the numbers vary from about 6 to 9 steady. However on the Hyper-V hosts that have this LUN connected the current/avg. disk queue length counters are much lower (usually below 1, with occasional spikes to 2 or 3) and nowhere near to what SANHQ is reporting. I've concurrently ran a live view session in SANHQ for this particular LUN and monitored perfmon counters on the Hyper-V servers and that confirmed me what I wrote above. What could be the problem? For other LUNs the numbers match between SANHQ and the hosts.
high avg, queue depth on a LUN - mismatch between SANHQ and host perfmon 
counters