2.2.1.6 Stop a Service

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

Typically, the Exascale cluster automatically contains the required Exascale software services. However, as an Exascale administrator, you may occasionally need to stop a software service instance.

Note:

By default, Exascale uses automatic service placement to ensure that the required storage services are available across the Exascale cluster. Consequently, if you manually stop a software service instance (as described below), a replacement service instance is automatically started on another node (if possible).

To stop an Exascale service, use the ESCLI chservice command with the --stop option.

If you issue a command to stop service that is not running, then the command completes successfully but it has no effect.

• To stop an Exascale service on an Exadata storage server, the command syntax is:

  @> chservice --attributes name=service_cell --stop

  To identify the service instance you want to stop on an Exadata storage server, specify the name attribute using the format: name=service_cell.

  In the attribute value:

  • service: Specifies the service that you want to act on, which is one of the following:

    • cellsrv: Specifies the core Exadata cell services (CELLSRV, MS, and RS).

    • egs: Specifies the Exascale cluster service, also known as Exascale global service (EGS).

    • ers: Specifies the Exascale control service, also known as Exascale RESTful service (ERS).

    • syseds: Specifies the system vault manager service.

    • usreds: Specifies the user vault manager service.

    • bsm: Specifies the block store manager service.

    • bsw: Specifies the block store worker service.

  • cell: Specifies the name of the storage server (cell) that hosts the service.

    The cell must be identified by its name. Use the lscell command to find all cell names.

• To stop an Exascale service on an Exadata compute server, the command syntax is:

  @> chservice --attributes name=service_compute --stop

  To identify the service instance you want to stop on an Exadata compute server, specify the name attribute using the format: name=service_compute.

  In the attribute value:

  • service: Specifies the service that you want to act on, which is one of the following:

    • egs: Specifies the Exascale cluster service, also known as Exascale global service (EGS).

    • bsw: Specifies the block store worker service.

  • compute: Specifies the name of the compute server (dbserver) that hosts the service.

    Depending on the required service location, specify either the name of a specific compute node virtual machine (VM) or the Exadata compute node host domain (KVM host or Dom0).