3.7.0 HP StorageWorks HP Scalable NAS File Serving Software command reference guide HP Scalable NAS for Linux (AG513-96003, October 2009)

Description
The psfssema semaphore utility provides a simple synchronization mechanism for
managing cluster-wide file locks. This utility can be used in shell scripts on different
nodes of a cluster and takes advantage of the PSFS filesystem and its internode
communication abilities. For example, you might want to use cluster-wide file locking
in a Start or Stop script for a service or device monitor.
The options are:
-i <filename>
Create the PSFS command-line semaphore file <filename> and the supplemental
file <filename.pid> if either file does not already exist. The command then
initializes the files to create the PSFS command-line semaphore. <filename>
must be a path on a PSFS filesystem.
-g <filename>
Lock the PSFS command-line semaphore associated with <filename>, which
is the name of a semaphore file created by psfssema -i. If the semaphore is
already locked by another node in the cluster, the calling process blocks until
the semaphore becomes available.
An error is returned if <filename> does not exist or has not been initialized
by psfssema -i, or if <filename.pid> does not exist.
-r <filename>
Unlock the PSFS command-line semaphore associated with <filename>, which
is the name of a semaphore file created by psfssema -i. If other nodes are
blocked on the semaphore when psfssema -r is called, one of the blocked
psfssema -g processes will return successfully.
-d <filename>
Delete the PSFS command-line semaphore associated with <filename>, which
is the name of a semaphore file created by psfssema -i. It also deletes <fi-
lename> and <filename.pid>.
psfssuspend – suspend a PSFS filesystem
Synopsis
/opt/hpcfs/tools/psfssuspend <directory_mountpoint>
Description
The psfssuspend utility suspends a PSFS filesystem in a stable, coherent, and
unchanging state. While the filesystem is in this state, you can copy it for backup
and/or archival purposes. When copying directly from a suspended device, be sure
Cluster commands66