Hi we are also experiencing this issue on a HP ML350p Gen 8 Server, this started when we added two new hard disks and changed the RAID configuration from RAID 5 to RAID 1+0, we have ESXi VMWare vSphere 5.5.0. Besides our disk controller is the P420 Smart Array 1GB FBWC, in our case the fluctuation happens when the temperature sensor for "Disk or DiskBay 1 08-HD" start to increasing without any logical reason from 35 celcius grades (normal temperature) up to 52 celcius, then the fans are elevating till 99.49%, the problem in our case is a system degradation due to a high DPC (Deferred procedure call) Queue by second in processor. We just have SQL Server 2008 R2 in a Windows 2008R2 virtual machine, so the big problem is impacting our transactional system. So if you think we have a very related issue I will appreciate you sharing more information with us.
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