Automatic restart management (ARM)

WebSphere® Application Server for z/OS® uses the z/OS automatic restart management (ARM) to recover application servers. Each application server running on a z/OS system (including servers you create for your business applications) are automatically registered with an ARM group. Each registration uses a special element type called SYSCB, which ARM treats as restart level 3, assuring that RRS restarts before any application server.

If you have an application that is critical for your business, you need facilities to manage failures. z/OS provides rich automation interfaces, such as ARM, that you can use to detect and recover from failures. ARM handles the restarting of servers when failures occur.

Tips:
  • If you have ARM enabled on your system, you might want to disable ARM for the WebSphere Application Server for z/OS address spaces before you install and customize WebSphere Application Server for z/OS. During configuration, job errors might cause unnecessary restarts of the WebSphere Application Server for z/OS address spaces. After installation and configuration, consider enabling ARM.
  • If you are ARM-enabled and you cancel or stop a server, it will restart in place using the armrestart command.
  • It is a good idea to set up an ARM policy for your deployment manager and node agents.
  • If you start the location service daemon on a system that already has one, it will terminate.
  • Every other server will come up on a dynamic port unless the configuration has a fixed port. Therefore, the fixed ports must be unique in a sysplex.
  • If you issue STOP, CANCEL, or MODIFY commands against server instances, be aware of how automatic restart management behaves regarding WebSphere Application Server for z/OS server instances:
    Table 1. Behavior of automatic restart management.

    This table describes the behavior of automatic restart management regarding WebSphere Application Server for z/OS server instances.

    If you issue . . . ARM will . . .
    STOP address_space not restart the address space
    CANCEL address_space not restart the address space
    CANCEL address_space, ARMRESTART restart the address space
    MODIFY address_space, CANCEL not restart the address space
    MODIFY address_space, CANCEL,ARMRESTART restart the address space

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Timestamp icon Last updated: March 5, 2017 23:57
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