EMC CLI - How to manually release lock from device

Verify that you are experiencing a device lock

To query for external device locks, issue:
symdev -lock list reported a lock on a single device.

To manually release the lock, issue:
symdev -lock # release

!! Use the release lock action only if you believe that the Symmetrix device lock was forgotten and there are NO other operations in progress to the specified Symmetrix devices
.
Be ready to recognize when a device lock being held by a certain application might be allocated as a long duration lock.

Example:
To list a range of Symmetrix devices (000 to 00A) that have a device external lock of 9, enter:
symdev list -sid 870 -lock 9 -RANGE 0:A -v

To release all Symmetrix devices in Symmetrix 870 that have a device external lock of 9, enter:
symdev release -sid 870 -lock 9

*** EMC PREFERRED ****
Release at the device group level if possible:
symdg -lock 9 release