GPFS: Administration and Programming Reference - IRA Home

mmchnsd Command
Options
NONE
DiskName:PrimaryServer:BackupServer
To remove the primary GPFS server, explicitly skip the parameter:
DiskName
BackupServer
The name of the backup NSD server node.
If the PrimaryServer has not been specified and this field is omitted, the disk is assumed
to be SAN-attached to all nodes in the cluster.
To remove the backup NSD server, explicitly skip the parameter, but ensure you have
specified the PrimaryServer or it will be removed also:
DiskName:PrimaryServer
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 mmchnsd command.
You may issue the mmchnsd 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
If the disk gpfs1nsd is currently defined with k145n05 as its primary server and k145n07 as its backup
NSD server, and you want to change the primary NSD server to k145n09, issue this command:
mmchnsd "gpfs1nsd:k145n09:k145n07:::"
To confirm the changes, issue this command:
mmlsnsd -d "gpfs1nsd"
The system displays information similar to:
File system Disk name Primary node Backup node
---------------------------------------------------------------
fs1 gpfs1nsd k145n09 k145n07
110 GPFS: Administration and Programming Reference