You can specify a time limit, or grace period, for clients to hold an exclusive lock on a z/OS NFS server resource. This time limit, or lease time, determines how long a client can hold a lock against a conflicting lock request. Once the time limit is reached, if the client has not extended the lease time, the lock may be revoked, and the lock will be revoked if NLM receives a conflicting request for the lock. This lease time also applies to the grace period that NFS clients have to reclaim NFS V4 locks and share reservations when the z/OS NFS server restarts after a failure. It also dictates the amount of time that a client ID can remain active on the server without communicating. To set this time limit, use the leasetime site attribute. For details, see Site attributes syntax.

During the reclaim grace period after a z/OS NFS server restart, the grace period may be extended after an open or lock reclaim event. If the leasetime site attribute is greater than 1200 seconds (20 minutes), the grace period will not be extended at a reclaim event; if the leasetimesite attribute is less than 20 minutes, the grace period will be extended by one lease time after the reclaim event, up to but not exceeding 20 minutes after the z/OS NFS server completed its restart.