mmcrnodeclass command

Creates user-defined node classes.

Synopsis

mmcrnodeclass ClassName -N {Node[,Node...] | NodeFile | NodeClass}

Availability

Available on all IBM Spectrum Scale editions.

Description

Use the mmcrnodeclass command to create user-defined node classes. After a node class is created, it can be specified as an argument on commands that accept the -N NodeClass option.

Parameters

ClassName

Specifies a name that uniquely identifies the user-defined node classes to create. An existing node name cannot be specified. Class names that end with nodes or system-defined node classes are reserved for use by GPFS.

-N {Node[,Node...] | NodeFile | NodeClass}

Specifies the nodes and node classes that will become members of the user-defined node class ClassName.

NodeClass cannot be a node class that already contains other node classes. For example, two user-defined node classes called siteA and siteB could be used to create a new node class called siteAandB, as follows:

mmcrnodeclass siteAandB -N siteA,siteB

The siteAandB node class cannot later be specified for NodeClass when creating new node classes.

For general information on how to specify node names, see Specifying nodes as input to GPFS commands.

Exit status

0: Successful completion.
nonzero: A failure has occurred.

Security

You must have root authority to run the mmcrnodeclass command.

The node on which the command is issued must be able to execute remote shell commands on any other node in the cluster without the use of a password and without producing any extraneous messages. For more information, see Requirements for administering a GPFS file system.

Examples

To create a user-defined node class called siteA that contains nodes c8f2c4vp1 and c8f2c4vp2, issue this command:

mmcrnodeclass siteA -N c8f2c4vp1,c8f2c4vp2

The system displays information similar to:

mmcrnodeclass: Propagating the cluster configuration data to all
  affected nodes.  This is an asynchronous process.

To display the member list of siteA, issue this command:

mmlsnodeclass siteA