GPFS: Administration and Programming Reference - IRA Home

mmdelnode Command
Name
mmdelnode Removes one or more nodes from a GPFS cluster.
Synopsis
mmdelnode {-a | -N Node[,Node...] | NodeFile | NodeClass]}
Description
Use the mmdelnode command to delete one or more nodes from the GPFS cluster. You may issue the
mmdelnode command on any GPFS node.
You must follow these rules when deleting nodes:
1. The node being deleted cannot be the primary or secondary GPFS cluster configuration server unless
you intend to delete the entire cluster. Verify this by issuing the mmlscluster command. If a node to
be deleted is one of the servers and you intend to keep the cluster, issue the mmchcluster command
to assign another node as the server before deleting the node.
2. A node being deleted cannot be the primary or backup NSD server for any disk unless you intend to
delete the entire cluster. Verify this by issuing the mmlsnsd command. If a node to be deleted is an
NSD server for one or more disks, use the mmchnsd command to assign another node as an NSD
server for the affected disks.
3. Unless all nodes in the cluster are being deleted, run the mmdelnode command from a node that will
remain in the cluster.
4. Before you can delete a node, you must unmount all of the GPFS file systems and stop GPFS on the
node to be deleted.
5. Exercise caution when shutting down GPFS on quorum nodes. If the number of remaining quorum
nodes falls below the requirement for a quorum, you will be unable to perform file system operations.
See the General Parallel File System: Concepts, Planning, and Installation Guide and search for
quorum.
Note: Since each cluster is managed independently, there is no automatic coordination and propagation
of changes between clusters like there is between the nodes within a cluster. This means that if you
permanently delete nodes that are being used as contact nodes by other GPFS clusters that can
mount your file systems, you should notify the administrators of those GPFS clusters so that they
can update their own environments.
Results
Upon successful completion of the mmdelnode command, the specified nodes are deleted from the GPFS
cluster.
Parameters
-a Delete all nodes in the cluster.
-N {Node[,Node...] | NodeFile | NodeClass}
Specifies the set of nodes to be deleted from the cluster. For general information on how to
specify node names, see “Specifying nodes as input to GPFS commands” on page 4.
Options
None.
This command does not support a NodeClass of mount.
Chapter 8. GPFS commands 159