I have an application that writes to its Device then  inside the array that Device is mirrored to an BCV.  When it is time for a backup a script will kick off that will break the mirror.
Then the backup application reads the data from that mirrored BCV.  Sometimes things will go wrong and that script will never resync the mirror.  That then results in broken backups.  To fix this I had to go into the VMAX3 SYMCLI and run these few commands.

1.  symdev -lock list
2. symdev release “Then confirm yes for each lock”

Looks really simple doesn’t it?  It took me a while to figure out.  It is not often I have to touch the VMAX and when I do it is usually with the GUI.  I also have a thick book of all the long complicated SYMCLI commands.  Thankfully through trial and error it ended up just being two simple commands.