Adding nodes to a GPFS cluster

You can add nodes to an existing GPFS™ cluster by issuing the mmaddnode command. The new nodes are available immediately after the successful completion of this command.

You must follow these rules when adding nodes to a GPFS cluster:

You may issue the command only from a node that already belongs to the GPFS cluster.
A node may belong to only one GPFS cluster at a time.
The nodes must be available for the command to be successful. If any of the nodes listed are not available when the command is issued, a message listing those nodes is displayed. You must correct the problem on each node and reissue the command to add those nodes.
After the nodes are added to the cluster, you must use the mmchlicense command to designate appropriate GPFS licenses to the new nodes.

To add node k164n01.kgn.ibm.com to the GPFS cluster, issue the following command:

mmaddnode -N k164n01.kgn.ibm.com

The system displays information similar to the following:

Mon Aug  9 21:53:30 EDT 2004: 6027-1664 mmaddnode: Processing node k164n01.kgn.ibm.com
mmaddnode: Command successfully completed
mmaddnode: 6027-1371 Propagating the cluster configuration data to all
  affected nodes.  This is an asynchronous process.

To confirm the addition of the nodes, issue the following command:

mmlscluster

The command displays information similar to the following:

GPFS cluster information
========================
  GPFS cluster name:         cluster1.kgn.ibm.com
  GPFS cluster id:           15529849231188177215
  GPFS UID domain:           cluster1.kgn.ibm.com
  Remote shell command:      /usr/bin/ssh
  Remote file copy command:  /usr/bin/scp
  Repository type:           CCR

 Node  Daemon node name     IP address       Admin node name      Designation
------------------------------------------------------------------------------
   1   k164n01.kgn.ibm.com   198.117.68.66    k164n01.kgn.ibm.com     
   2   k164n02.kgn.ibm.com   198.117.68.67    k164n02.kgn.ibm.com     
   3   k164n03.kgn.ibm.com   198.117.68.68    k164n03.kgn.ibm.com     quorum
   4   k164n04.kgn.ibm.com   198.117.68.69    k164n04.kgn.ibm.com     quorum
   3   k164n05.kgn.ibm.com   198.117.68.70    k164n05.kgn.ibm.com     quorum-manager

You can also use the installation toolkit to add nodes. For more information, see Adding nodes, NSDs, or file systems to an existing installation.

For complete usage information, see mmaddnode command, mmlscluster command and mmchlicense command.