Hello,   There are two issues.  One, not all hard drives report their RPM speed, it's optional.   Two, non Dell/EQL drives won't work in PS6000.  The Dell drives have custom firmware on them.    Regards, 
Hello, One of our 15K SAS drives died and we bought 2 from Amazon vendor yobitech.  It's on the second Slot (Slot 1).  The PS6000 shows it is a Spare, Healthy, No errors, etc., but the Speed shows "unknown".  The Warning tab shows "One or more drives in array are not approved".  We don't have support on this array anymore.  What can I do at this point? Thanks in advance.
PS6000 Disk Speed "unknown"