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 storage 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 storage 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 storage 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 Exadata Cell Server (CELLSRV).

    • 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 (BSM) service.

    • bsw: Specifies the block store worker (BSW) 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 storage 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). Use the lscomputeserver command to display information about compute servers associated with the Exascale cluster.