[z/OS]

Enabling or Disabling the reusable ASID function

If you are running the product on z/OS Version 1.9 or higher, you can use the updateZOSStartArgs script that is provided with the product to control for which of your servers, z/OS can reuse address space identifiers (ASIDs) that are associated with cross-process services when those services end.

Before you begin

About this task

As stated in the z/OS Version 1.9 publication Communications Server IP Configuration Guide, SC31-8775-11, the TCP/IP address space provides cross-process routines, such as PC-entered services, that must be accessible to all address spaces. This requirement means that the Address Space Identifier (ASID) that is associated with the TCP/IP address space is not reusable when the address space is stopped or restarted. If the TCP/IP address space is terminated enough times, all available ASIDs might be exhausted, preventing the creation of a new address space on the system. If this situation occurs, you must stop z/OS and re-IPL.

New feature New feature: z/OS Version 1.9 and higher includes a reusable ASID function that enables you to permit the use of all ASIDs, including those that are associated with cross-process services. If you run z/OS with this function enabled, you can use the updateZOSStartArgs script to enable or disable this function for a particular server, a particular node, or for all of your servers.newfeat
Avoid trouble Avoid trouble:
  • If you are running the product in a mixed cell environment, even if you enable this function for all of your servers, only Version 6.1 and higher servers are able to use this function. For example, if you are running some Version 6.0 servers on your system, these servers cannot reuse the ASIDs that are associated with cross-process services.
  • If you run the updateZOSStartArgsscript on z/OS Versions 1.6, 1.7, or 1.8, you will not get an error message. However those versions of z/OS ignore the z/OS Start argument that enables the reusable ASID function because the reusable ASID function is not available on those versions of z/OS.
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Procedure

Results

After you run this script, the function remains enabled for the affected servers until you run the script to explicitly disable it.

If you enable this function in PARMLIB member DIAGxx for all of your servers, the function is automatically enabled for any new server that you create.

The REUSASID parameter is automatically set to YES for any new servers that you create. You do not need to rerun the updateZOSStartArgs script on newly created servers unless you want to disable the reuse ASID capability.




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Last updatedLast updated: Aug 31, 2013 1:23:07 AM CDT
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