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Chapter 1: HP Clustered File System Commands 38

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 <filename> 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 to use the raw device (/dev/rpsd/...) to ensure

that all blocks copied are up-to-date.

The filesystem is essentially unusable while it is suspended; however,

applications that can tolerate extended waits for I/O do not need to be

terminated.

The psfsresume utility restores a suspended filesystem. The psfssuspend

and psfsresume utilities affect the specified filesystem on all servers

where it is mounted; however, the utilities should be executed on only

one server in the cluster.

To suspend a filesystem, issue the following command on one server that

has mounted the filesystem. You must be user root.

/opt/hpcfs/tools/psfssuspend directory_mountpoint

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