GPFS: Administration and Programming Reference - IRA Home

mmexportfs Command
Name
mmexportfs - Retrieves the information needed to move a file system to a different cluster.
Synopsis
mmexportfs {Device | all} -o ExportFilesysData
Description
The mmexportfs command, in conjunction with the mmimportfs command, can be used to move one or
more GPFS file systems from one GPFS cluster to another GPFS cluster, or to temporarily remove file
systems from the cluster and restore them at a later time. The mmexportfs command retrieves all
relevant file system and disk information and stores it in the file specified with the -o parameter. This file
must later be provided as input to the mmimportfs command. When running the mmexportfs command,
the file system must be unmounted on all nodes.
When all is specified in place of a file system name, any disks that are not associated with a file system
will be exported as well.
Exported file systems remain unusable until they are imported back with the mmimportfs command to the
same or a different GPFS cluster.
Results
Upon successful completion of the mmexportfs command, all configuration information pertaining to the
exported file system and its disks is removed from the configuration data of the current GPFS cluster and
is stored in the user specified file ExportFilesysData.
Parameters
Device | all
The device name of the file system to be exported. File system names need not be fully-qualified.
fs0 is as acceptable as /dev/fs0. Specify all to export all GPFS file systems, as well as all disks
that do not belong to a file system yet. This must be the first parameter.
-o ExportFilesysData
The path name of a file to which the file system information is to be written. This file must be
provided as input to the subsequent mmimportfs command.
Exit status
0 Successful completion.
nonzero A failure has occurred.
Security
You must have root authority to run the mmexportfs command.
You may issue the mmexportfs 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 mmchcluster command, you
must ensure:
1. Proper authorization is granted to all nodes in the GPFS cluster.
174 GPFS: Administration and Programming Reference