Hi DexterLJ,   as far as I'm aware there is not support for the PERC RAID controller. Here is an article I found: [URL]   Even the documentation does not tell it is supported - what I learned in my years with Dell is, if it is not written down it is not there    RegardsStefan
Hello, may I ask, if TRIM/UNMAP is possible on DELL PowerEdge servers? I tried to reclaim free space on many Windows 2012+ servers and all servers running on vmware (version 6.0 - 6.7) on vSAN or not. And all tries ended by this message "The operation requested is not supported by the hardware backing the volume" I am not sure, if it is because of type of HW.  There is setting according to "[URL]" but the "defrag /L" or "Optimize-Volume  -ReTrim" end by the bolded message above, but the message is not relevant for another servers out of DELL HW. Anyway, for my DELL laptop is the command also working. Is there some limitation by storage controller, firmware or something? Thank you  
Trim/UNMAP on DELL PowerEdge R630 with vSAN