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Chapter 1: HP Clustered File System Commands 25

Some NFS clients will return an error to the client applications if the

lock cannot be reclaimed. Other clients (for example, the Linux 2.6

NFS client) will not return any error. If no error is returned by the

client, the application may proceed under the false assumption that

the lock has been granted. Data corruption may be the result.

To prevent this situation, locking should be enabled only if your

clients are partitioned so that all clients needing a particular lock are

using the same Virtual NFS Service IP address. If a failover occurs, all

of the clients will lose their locks. They can then reclaim those same

locks on the new node without conflicts from outside clients.

The options are as follows:

-q

Show the current status of NLM locking in the cluster (either

enabled or disabled).

-e

Enable NLM locking in the cluster. No reboot is necessary; the

change is effective almost immediately and may affect clients.

-d

Disable NLM locking in the cluster. No reboot is necessary; the

change is effective almost immediately and may affect clients.

mxpasswd – add users or change passwords

Synopsis

/opt/hpcfs/bin/mxpasswd

Description

To add a new HP Clustered File System user and password, use the

following syntax, where user and password are enclosed in curly braces.

You must be user root.

# mxpasswd

mxpasswd> {user}{password}

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Seagate ST336704FC Guia de preparacion Pagina 31