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mmchconfig Command
Name
mmchconfig – Changes GPFS configuration parameters.
Synopsis
mmchconfig Attribute=value[,Attribute=value...] [-i | -I] [-N {Node[,Node...] | NodeFile | NodeClass}]
Description
Use the mmchconfig command to change the GPFS configuration attributes on a single node, a set of
nodes, or globally for the entire cluster.
The Attribute=value flags must come before any operand.
When changing both maxblocksize and pagepool, the command fails unless these conventions are
followed:
v When increasing the values, pagepool must be specified first.
v When decreasing the values, maxblocksize must be specified first.
Results
The configuration is updated on each node in the GPFS cluster.
Parameters
-N {Node[,Node...] | NodeFile | NodeClass}
Specifies the set of nodes to which the configuration changes apply. For general information on how to
specify node names, see “Specifying nodes as input to GPFS commands” on page 4.
The -N flag is valid only for the automountDir, dataStructureDump, designation,
dmapiEventTimeout, dmapiMountTimeout, dmapiSessionFailureTimeout, maxblocksize,
maxFilesToCache, maxStatCache, nsdServerWaitTimeWindowOnMount,
nsdServerWaitTimeForMount, pagepool, and unmountOnDiskFail attributes.
This command does not support a NodeClass of mount.
Options
Attribute
The name of the attribute to be changed to the specified value. More than one attribute and value pair,
in a comma-separated list, can be changed with one invocation of the command.
To restore the GPFS default setting for any given attribute, specify DEFAULT as its value.
autoload
Starts GPFS automatically whenever the nodes are rebooted. Valid values are yes or no.
automountdir
Specifies the directory to be used by the Linux automounter for GPFS file systems that are being
automatically mounted. The default directory is /gpfs/myautomountdir. This parameter does not apply
to AIX environments.
cipherList
Controls whether GPFS network communications are secured. If cipherList is not specified, or if the
value DEFAULT is specified, GPFS does not authenticate or check authorization for network
connections. If the value AUTHONLY is specified, GPFS does authenticate and check authorization for
88 GPFS: Administration and Programming Reference