A fix is available
APAR status
Closed as program error.
Error description
An inop of a single TG is causing other RTP PUs on other TGs to be scheduled for path switch incorrectly.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All users of the IBM Communications Server * * z/OS Version 2 Release 1 and Version 2 Release 2 * * HPR * **************************************************************** * PROBLEM DESCRIPTION: * * Excessive path switches occuring for PSRETRY: * * IST1821I PATH SWITCH REASON: AUTO PATH SWITCH FOR PSRETRY * **************************************************************** * RECOMMENDATION: * * Apply PTF. * **************************************************************** The problem is summarized as follows: 1) DWINOP=YES is specified on both sides of an EE connection. The general rule is to only specify this on one end of the connection to avoid EE dial contention which results in EE connection setup failures. 2) One end of the EE connection defined both a switched PU and allowed dynamic EE PUs to be defined (model EE PU defined). The switched PU definition specified a TGP paramater, but the EE model PU does not. 3) The EE connection was connecting and disconnecting due to the DWINOP contention identified in step 1. This lead to both TG21 and TG22 being activated and deactivated, randomly being assigned either the switched PU definition or by using a dynamic PU generated from the EE model PU definition. 4) When a TG is activated and the TG characteristics are detected by the VTAM TRS component to be changed, this results in VTAM scheduling all RTP pipes to perform a HPR path switch to pick up the new TG characteristics. 5) Because of the DWINOP contention, and the mismatched TGP (TG characteristics) in the model EE PU and predefined switched EE PU do not match, this led to excessive HPR pipe switches occuring on this node. IST1494I PATH SWITCH STARTED FOR RTP CNRxxxxx TO xxxxxxxx.xxxxxxxx IST1821I PATH SWITCH REASON: AUTO PATH SWITCH FOR PSRETRY IST314I END
Problem conclusion
ISTTRTTG - Updated to perform HPR path switches for TG characteristic changes only when the PSRETRY IMMEDIATE start option is specified. ISTTROMT - Commentary change only. ISTRPCRT - Included for maintenance pursposes.
Temporary fix
Comments
APAR Information
APAR number
OA51857
Reported component name
VTAM V4 MVS/ESA
Reported component ID
569511701
Reported release
210
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-01-04
Closed date
2017-01-12
Last modified date
2017-04-03
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UA83778 UA83779
Modules/Macros
ISTRPCRT ISTTROMT ISTTRTTG
Fix information
Fixed component name
VTAM V4 MVS/ESA
Fixed component ID
569511701
Applicable component levels
Fix is available
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Document Information
Modified date:
03 April 2017