GPFS: Administration and Programming Reference - IRA Home

-F DiskFile
Specifies a file containing the names of the NSDs, one per line, to be included or excluded by the
mmfsctl command.
-G FailureGroup
A number identifying the failure group for disks to be included or excluded by the mmfsctl
command.
-n RemoteNodesFile
Specifies a list of contact nodes in the peer recovery cluster that GPFS uses when importing the
configuration data into that cluster. Although any node in the peer cluster can be specified here,
users are advised to specify the identities of the peer cluster’s primary and secondary cluster
configuration servers, for efficiency reasons.
-S SpecFile
Specifies the description of changes to be made to the file system, in the peer cluster during the
import step. The format of this file is identical to that of the ChangeSpecFile used as input to the
mmimportfs command. This option can be used, for example, to define the assignment of the
NSD servers for use in the peer cluster.
Options
None.
Exit status
0 Successful completion.
nonzero A failure has occurred.
Results
The mmfsctl command returns 0 if successful.
Security
You must have root authority to run the mmfsctl command.
You may issue the mmfsctl 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
This sequence of commands creates a FlashCopy image of the file system and propagates this image to
the recovery cluster using the Peer-to-Peer Remote Copy technology. The following configuration is
assumed:
Site LUNs
Primary cluster (site A) lunA1, lunA2
Recovery cluster (site B) lunB1
lunA1 FlashCopy source
mmfsctl Command
Chapter 8. GPFS commands 183