What to do when the VMware vSphere ESXi UNMAP command doesn’t release space on some or all volumes on a Dell EqualLogic SAN array running v8 firmware (may apply to other versions too).

Symptoms When running the diag command from the Dell EqualLogic CLI (via a SSH session to an EqualLogic member) the process proceeds as normal but never completes, and the SSH session is eventually terminated. Repeating the operation produces the same result. Example Output: 1login as: grpadmin 2grpadmin@xxxxx's …

Whilst trying to update firmware on a Dell EqualLogic PS6500 I received the error FTP: Permission denied: recv failed. It turns out that this was down to a Java problem on my Windows 7 workstation, rather than the EqualLogic.