GPFS: Administration and Programming Reference - IRA Home

fully qualified domain name. Otherwise, to make the cluster name unique, the domain of the primary
configuration server will be appended to the user-provided name.
Since each cluster is managed independently, there is no automatic coordination and propagation of
changes between clusters like there is between the nodes within a cluster. This means that if you
change the name of the cluster, you should notify the administrators of all other GPFS clusters that can
mount your file systems so that they can update their own environments. See the mmauth,
mmremotecluster, and mmremotefs commands.
-N {NodeDesc[,NodeDesc...] | NodeFile}
Specifies a list or file of node descriptors specifying node names for use by the GPFS administration
commands.
Each node descriptor has the following format:
DaemonNodeName::AdminNodeName
DaemonNodeName
Specifies the name of the node to be used by GPFS daemon to daemon communication. The
daemon node name may be specified as a short or long node name, an IP address, or a node
number.
AdminNodeName
Specifies the name of the node to be used by GPFS administration commands when communicating
between nodes. The admin node name must be specified as an IP address or a short or long node
name that is resolved by the host command to the desired IP address.
-p PrimaryServer
Change the primary server node for the GPFS cluster data. This may be specified as a short or long
node name, an IP address, or a node number.
LATEST – Synchronize all of the nodes in the GPFS cluster ensuring they are using the most recently
specified primary GPFS cluster configuration server. If an invocation of the mmchcluster command
fails, you are prompted to reissue the command and specify LATEST on the -p option to synchronize
all of the nodes in the GPFS cluster. Synchronization provides for all nodes in the GPFS cluster to use
the most recently specified primary GPFS cluster configuration server.
-s SecondaryServer
Change the secondary server node for the GPFS cluster data. To remove the secondary GPFS server
and continue operating without it, specify a null string, "", as the parameter. This may be specified as a
short or long nodename, an IP address, or a node number.
Options
-R RemoteFileCopy
Specifies the fully-qualified path name for the remote file copy program to be used by GPFS.
The remote copy command must adhere to the same syntax format as the rcp command, but may
implement an alternate authentication mechanism.
-r RemoteShellCommand
Specifies the fully-qualified path name for the remote shell program to be used by GPFS.
The remote shell command must adhere to the same syntax format as the rsh command, but may
implement an alternate authentication mechanism.
Exit status
0 Successful completion.
nonzero A failure has occurred.
mmchcluster Command
Chapter 8. GPFS commands 85