HP Serviceguard Toolkit for NFS manual Overview of the NFS File Lock Migration Feature

Overview of Serviceguard NFS

Overview of the NFS File Lock Migration Feature

• Any client that holds NFS file locks against files residing in the HA/NFS package (transitioned between servers) sends reclaim requests to the adoptive node (where the exported filesystems currently reside) and reclaims its locks.

• After rpc.statd sends the crash recovery notification messages, the

	SM entries in the package holding directory are removed, and the
	nfs.flm script is started on the adoptive node. The script once again
	copies each /var/statmon/sm file on the HA/NFS server into the
	holding directory, every five seconds. Each file residing in the
	/var/statmon/sm directory on the adoptive node following the
	package migration represents a client that either reclaimed its locks
	after failover or has established new locks after failover.
NOTE	To enable the File Lock Migration feature, you need Serviceguard
	version A.11.15 or above.
	To ensure that the File Lock Migration feature functions properly, install
	HP-UX 11i v1 NFS General Release and Performance Patch,
	PHNE_26388 (or a superseding patch). For HP-UX 11i v2, the feature
	functions properly without a patch.

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