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Dial usability - DWACT, DWINOP, KEEPACT, REDIAL, and REDDELAY z/OS Communications Server: SNA Network Implementation Guide SC27-3672-01 |
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To enable EE connections to automatically activate (without having to issue VARY DIAL commands), put both the EE XCA major node and the switched major node in the VTAM® configuration list, and specify DWACT=YES on the EE switched PUs. When VTAM initialization completes, the EE connections will fully activate without further intervention. When the connections are activated, they should be automatically recovered after any type of failure (such as an IP network problem or even a loss of the TCP/IP stack itself). Certain operands automate the recovery of the EE switched
PUs and LINEs when initial activation fails, or when a later connection
failure is detected. The operands include:
When an EE connection is composed of two z/OS® EE endpoints, specifying DWACT=YES or DWINOP=YES on both endpoints can lead to both hosts attempting to initiate or recover an EE connection simultaneously. This can produce unnecessary dial collisions, resulting in delayed activation or recovery, or in some cases failed activation or recovery. Guideline: When coding DWACT=YES,
DWINOP=YES, or both, specify it on only one side of the connection
to avoid PU busy conflicts.
Tip: When coding DWINOP=YES, also consider coding
the REDIAL and REDDELAY operands on the corresponding switched major
node PATH statement. The current defaults for these two parameters
are REDIAL=3 and REDDELAY=30. With these defaults values, z/OS Communications Server retries
for only approximately 120 seconds after an INOP before giving up
attempts to contact the partner EE node.
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