Configuring the GPFS cluster
There are several tasks involved in managing your GPFS cluster. This topic points you to the information you need to get started.
GPFS cluster
management tasks include the following.
- Creating your GPFS cluster
- Displaying cluster configuration information
- Specifying nodes as input to GPFS commands
- Adding nodes to a GPFS cluster
- Deleting nodes from a GPFS cluster
- Changing the GPFS cluster configuration data
- Cluster quorum with quorum nodes
- Cluster quorum with quorum nodes and tiebreaker disks
- Displaying and changing the file system manager node
- Determining how long mmrestripefs takes to complete
- Starting and stopping GPFS
Note: In IBM Spectrum
Scale V4.1.1 and later, many of these
tasks can also be handled by the installation toolkit configuration
options. For more information on the installation toolkit, see Using the installation toolkit to perform installation tasks: Explanations and examples.
For information on RAID administration, see IBM Spectrum Scale RAID: Administration.
- Creating your GPFS cluster
You must first create a GPFS cluster by issuing the mmcrcluster command. - Displaying cluster configuration information
Use the mmlscluster command to display cluster configuration information. - 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. - Deleting nodes from a GPFS cluster
You can delete nodes from a GPFS cluster by issuing the mmdelnode command. - Changing the GPFS cluster configuration data
You can use the mmchcluster or mmchconfig commands to change the configuration attributes. - Security mode
The security mode of a cluster determines the level of security that the cluster provides for communications between nodes in the cluster and also for communications between clusters. 
Minimum release level of a cluster
The minimum release level of a cluster is the currently enabled level of functionality of the cluster. It is expressed as a IBM Spectrum Scale version number, such as 5.0.2.0.- Running IBM Spectrum Scale commands without remote root login
With sudo wrapper scripts you can avoid configuring nodes to allow remote root login. - Cluster quorum with quorum nodes
Cluster quorum defines the minimum number of GPFS quorum nodes that must have the GPFS daemon actively running on them for the cluster to be operational. This number is half of the defined GPFS quorum nodes plus one, so it is a good idea to have an odd number of GPFS quorum nodes defined. Cluster quorum using only GPFS quorum nodes is the default quorum algorithm. - Cluster quorum with quorum nodes and tiebreaker disks
To use cluster quorum with quorum nodes and tiebreaker
disks, additional requirements apply. - Displaying and changing the file system manager node
In general, GPFS performs the same functions on all nodes. There are also cases where one node provides a more global function that affects the operation of multiple nodes. For example, each file system is assigned a node that functions as a file system manager. - Starting and stopping GPFS
You can use the mmstartup and mmshutdown commands to start and stop GPFS on new or existing clusters. - Shutting down an IBM Spectrum Scale cluster
Use the following information to shut down an IBM Spectrum Scale cluster in an emergency situation.
Parent topic: Configuring