Quick update to close this thread. I recently had reason to restart the SAN controllers. This resulted in SAN HQ returning to its normal state of monitoring all IOPS for all volumes.
SAN: Equallogic PS6100   We experienced a long power outage on Feb 15. Normally that doesn't concern me as we have a Generac generator that is supposed to kick in when it sees our power going down. Unfortunately that generator did not kick in, it was frozen due to extreme cold temperatures. When power was restored and the SAN came back up I noticed that SAN HQ was no longer actively tracking IOPS on its volumes. We use PRTG to monitor our network. It also monitors volumes on this SAN. Prior to the power outage it was able to monitor volumes for things like Average Read Latency, Read Ops, Write Ops, etc. Now it is only seeing general things like Downtime, Availability and Operations Status. I've read through several guides about SAN HQ and searched all over the internet to find a solution as to why it is no longer monitoring the statistics that I need to see. I have not found a solution. Does anyone have an idea what might be wrong and what I might do to fix the problem? The only thing I have not tried at this point is to reboot the device. Difficult to do when you are a 24/7 company and virtual servers need to remain powered on.
Dell SAN HQ has stopped monitoring IOPS