Planned Graceless Recovery

Starting in the Oracle Solaris 11.4 release, the planned graceless recovery (PGR) feature enables an NFS server to preserve the NFS Version 4.0 or NFS Version 4.1 protocol state across NFS service restarts and graceful system reboots. The PGR feature avoids the typical data downtime associated with the NFS service restarts or server reboots by avoiding the grace period altogether.

However, PGR is ineffective when the system panics or experiences power loss. For more information about how the client recovers its state, see Client Recovery in NFS Version 4.