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 automatic restart management, that you can use to detect and recover
from failures. Automatic restart management handles the restarting of servers
when failures occur.
Tips:
- If you have automatic restart management (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 customization, job errors might cause unnecessary restarts of the WebSphere Application
Server for z/OS address
spaces. After installation and customization, 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 regarding WebSphere Application
Server for z/OS server
instances
If you issue . . . |
Automatic restart management 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 |