2.2.1.3 Alter the Number of Service Instances

Exascale system components are implemented using a series of software services.

By default, each Exascale cluster is configured with a number of storage service instances that is usually sufficient for most workloads. However, as an Exascale administrator, you can alter the number of service instances that are deployed.

To alter the number of storage service instances deployed in the Exascale cluster, use the ESCLI chcluster command as follows:

@> chcluster --attributes attributeName=value

In the command, specify one of the following as the attributeName:

• numControlServicesFrontends: The number of Control Service (ERS) instances that contain front-end and back-end processes.

• numControlServicesBackends: The number of Control Service (ERS) instances that contain only back-end processes.

• numSystemVaultManagers: The number of System Vault Manager (SYSEDS) instances.

• numUserVaultManagers: The number of User Vault Manager (USREDS) instances.

• numVolumeManagers: The number of Block Store Manager (BSM) instances.

• numStorageVolumeWorkers: The number of Block Store Worker (BSW) instances.

Note:

You cannot alter the number of Exascale cluster services (EGS). EGS always runs on five nodes in the Exascale cluster.