2.2.1.4 Alter the Placement of Services

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

By default, the software service instances are distributed across the Exascale cluster with the aim of evenly distributing the overall workload. However, as an Exascale administrator, you can alter the placement of the services to optimize the workload balance.

To alter the placement of Exascale services, you can start a service on a node where it is not running and then disable the same service on another node where it is running.

For example, you can use the following ESCLI command sequence to alter the placement of block store worker service (BSW) by starting the service on cell09 and disabling it on cell03.

@> chservice --attributes name=bsw_cell09 --start
@> chservice --attributes name=bsw_cell03 --disable

Note:

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