CA IDMS Batch programs may abort when WLM Soft Capping is in effect.
Article ID: 48732
Updated On:
Products
Issue/Introduction
Description:
During the time WLM Soft Capping is active it is possible that CA IDMS Batch-to-CV programs may abort with a timeout failure. Message
"DC410003 DNS SEND/RECEIVE Failure Status is: 5839" may occur on either the CV or the batch side.
Solution:
Work Load Manager (WLM) "Soft Capping" can reduce the number of MIPs or MSUs being delivered to an LPAR when it determines that the load on the LPAR (for the last 4-hour interval) is in excess of predefined limits. If the number of MIPS is suddenly reduced and if DC's external wait time is set too tightly, then requests can timeout unexpectedly (just like what happens when a higher priority job or STC starts recursively abending). You can determine if Soft Capping is in effect by the presence of the following message in the job's JES log:
"lpar-name LPAR SOFT CAPPED BY WLM"
If a site really wants/needs to run capping, and if these timeouts are more than a very rare occurrence, then the site should loosen up (or increase) IDMS/DC's external wait time. The purpose of the external wait time is not so much to dictate how fast the other program must respond as it is to make sure that the other program doesn't sit there for hours holding resources.
Code 5839 is like 1469 and 0069. They are all initial default values filled out by a front end under the assumption that the request will fail. It is theoretically possible to observe this code on a back end CV based on the actual timing of the failure.
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