IBM General Parallel File System for AIX: Administration and Programming Reference

mmdelcluster Command

Name

mmdelcluster - Deletes nodes from a GPFS cluster.

Synopsis

mmdelcluster {-n NodeFile | NodeName[,NodeName ...]}

Description

Use the mmdelcluster command to delete nodes from a GPFS cluster. You must follow these rules when deleting nodes:

The nodes being deleted cannot be part of any nodeset. The -c option must be used on the mmdelnode command prior to deleting the nodes from the GPFS cluster to adjust the list of cluster nodes in the GPFS cluster data.
The nodes being deleted cannot be the primary or secondary GPFS cluster data server. Verify this by issuing the mmlscluster command. If they are, issue the mmchcluster command before deleting the nodes.

Results

Upon successful completion of the mmdelcluster command, the specified nodes are deleted from the GPFS cluster. The nodes can no longer be used by GPFS file systems within the GPFS cluster.

Parameters

-n NodeFile

NodeFile consists of a list of NodeNames one per line to be deleted from the GPFS cluster.

NodeName[,NodeName...]

A comma-separated list of nodes to be deleted from the GPFS cluster.

The hostname or IP address used for a node must refer to the adapter port over which the GPFS daemons communicate. Alias interfaces are not allowed. Use the original address or a name that is resolved by the host command to that original address. You may specify a node using any of these forms:

Format Example
Short hostname k145n01
Long hostname k145n01.kgn.ibm.com
IP address 9.119.19.102

Format	Example
Short hostname	k145n01
Long hostname	k145n01.kgn.ibm.com
IP address	9.119.19.102

Options

NONE

Exit status

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

Security

You must have root authority to run the mmdelcluster command.

You may only issue the mmdelcluster command from a node that will remain in the GPFS cluster.

When using rcp and rsh 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 insure:

Proper authorization is granted to all nodes in the GPFS cluster.
The nodes in the GPFS cluster can communicate without the use of a password.

Examples

To delete the nodes k145n08, k145n09, and k145n10, enter:

mmdelcluster  k145n08,k145n09,k145n10

To confirm the deletion, enter:

mmlscluster

The system displays information similar to:

GPFS cluster information                           
========================                           
  Cluster id:  gpfs0103263/15/01M03                
  Remote shell command:      /usr/bin/rsh          
  Remote file copy command:  /usr/bin/rcp          
                                                   
GPFS cluster data repository servers:              
-------------------------------------              
  Primary server:    k145n43.kgn.ibm.com        
  Secondary server:  k145n44.kgn.ibm.com        
                                                   
Nodes in nodeset 1:                                
-------------------                                
  1  k145n29  9.114.133.29  k145n29.kgn.ibm.com  
  2  k145n30  9.114.133.30  k145n30.kgn.ibm.com  
  3  k145n31  9.114.133.31  k145n31.kgn.ibm.com  
  4  k145n32  9.114.133.32  k145n32.kgn.ibm.com  
                                                   
Nodes in nodeset 2:                              
---------------------                              
  5  k145n33  9.114.133.33  k145n33.kgn.ibm.com  
  6  k145n34  9.114.133.34  k145n34.kgn.ibm.com  
  7  k145n35  9.114.133.35  k145n35.kgn.ibm.com  
  8  k145n36  9.114.133.36  k145n36.kgn.ibm.com  
  9  k145n37  9.114.133.37  k145n37.kgn.ibm.com  
  10  k145n38  9.114.133.38  k145n38.kgn.ibm.com 
  11  k145n39  9.114.133.39  k145n39.kgn.ibm.com 
  12  k145n40  9.114.133.40  k145n40.kgn.ibm.com 
  13  k145n41  9.114.133.41  k145n41.kgn.ibm.com 
  14  k145n42  9.114.133.42  k145n42.kgn.ibm.com 
  15  k145n43  9.114.133.43  k145n43.kgn.ibm.com 
  16  k145n44  9.114.133.44  k145n44.kgn.ibm.com 
  17  k145n45  9.114.133.45  k145n45.kgn.ibm.com 
  18  k145n46  9.114.133.46  k145n46.kgn.ibm.com 
                                                   
Cluster nodes that are not assigned to a nodeset:  
-------------------------------------------------  
  19  k145n47  9.114.133.47  k145n47.kgn.ibm.com

See also

Location

/usr/lpp/mmfs/bin

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