GPFS: Administration and Programming Reference - IRA Home

mmchmgr Command
Name
mmchmgr – Assigns a file system manager node.
Synopsis
mmchmgr Device [Node]
Description
The mmchmgr command assigns a file system manager node.
Parameters
Device
The device name of the file system for which the file system manager node is to be changed. File
system names need not be fully-qualified. fs0 is just as acceptable as /dev/fs0.
This must be the first parameter.
Node The target node to be appointed as the new file system manager. If no Node is specified, the
configuration manager selects the new file system manager node.
Options
NONE
For general information on how to specify node names, see “Specifying nodes as input to GPFS
commands” on page 4.
Exit status
0 Successful completion.
nonzero A failure has occurred.
Security
You must have root authority to run the mmchmgr command.
You may issue the mmchmgr command from any node in the GPFS cluster.
When using the rcp and rsh commands for remote communication, a properly configured .rhosts file must
exist in the root user’s home directory on each node in the GPFS cluster. If you have designated the use
of a different remote communication program on either the mmcrcluster or the mmchcluster command,
you must ensure:
1. Proper authorization is granted to all nodes in the GPFS cluster.
2. The nodes in the GPFS cluster can communicate without the use of a password, and without any
extraneous messages.
Examples
Assume the file system manager for the file system gpfs1 is currently k164n05. To migrate the file system
manager responsibilities to k164n06, issue this command:
mmchmgr gpfs1 k164n06
The system displays information similar to:
Chapter 8. GPFS commands 107