User's Manual

Overview 27

Nortel Networks Confidential

these sessions either receive no indication or continue to hear an

alerting tone for an indefinite period of time.

Manual failover

There are two recommended procedures for manually initiating the

fail-over of an active instance to a Standby node: the initiation of

discrete LOCK and UNLOCK actions, or the initiation of a restart.

Lock/Unlock If you want to force a fail-over in order to perform

maintenance on the "failed" server, then request a LOCK from the

Management Console. The LOCK forces the component into a

disabled operational state, where it remains until you request an

UNLOCK from the Management Console. You can perform any

maintenance on the "failed" server while it is LOCKed. Once

maintenance is complete, the server can be UNLOCKed from the

Management Console, which causes an automatic restart and brings

the server back into service.