Use the following procedure to remove extraneous system updates. To avoid accruing too much space on the system disks, maintain no more than three updates at any given time.
hostname:> maintenance system updates
hostname:maintenance system updates> show Updates: UPDATE RELEASE DATE STATUS ak-nas@2013.06.05.1,1-1.2 2013-12-6 23:37:50 previous ak-nas@2013.06.05.2.0,1-1.9 2014-5-28 15:20:06 current ak-nas@2013.06.05.3.0,1-1.14 2014-12-19 14:31:49 waiting
hostname:maintenance system updates> destroy ak-nas@2013.06.05.1,1-1.2
This will destroy the update "ak-nas@2013.06.05.1,1-1.2". Are you sure? (Y/N) Y