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The following start options also affect VTAM® processing in a multiple-domain subarea
network: - CDRSCTI start option
- In a multiple-domain environment, you define resources that are
controlled by a VTAM in another
domain using a cross-domain resource (CDRSC) definition statement.
However, if you do not code the CDRSC definition statement, you can
specify that a CDRSC definition be dynamically created by using the
CDRSC=OPT operand on the cross-domain resource manager (CDRM) definition
statement that defines that VTAM. If your VTAM dynamically
defines a cross-domain resource, that dynamic definition can be retained
by VTAM for a user-specified
period of time or deleted immediately after the last session for that
cross-domain resource terminates. The cross-domain resource timeout
value (CDRSCTI) start option determines the processing VTAM uses for dynamic cross-domain resources.
The value of this start option specifies the amount of time that VTAM is to retain the control blocks
for a dynamic cross-domain resource after all sessions with that resource
are terminated. For more information, see Dynamic definition of cross-domain resources.
- IOPURGE start option
- During cross-domain
session initiation, a CDINIT is sent to the adjacent node that is
most likely to be the resource owner. If a positive response is received,
session setup continues with that adjacent SSCP. If a negative response
is received indicating the resource was not found, the next adjacent
SSCP that potentially owns the resource is obtained from the adjacent
SSCP table and a CDINIT is sent to it. This continues until the resource
is either found or the adjacent SSCP table is exhausted.
A situation
could arise where the adjacent SSCP that was queried has a critical
failure and cannot respond. In this case, the node that is trying
to initiate the session waits forever for a reply (IOPURGE=0, the
default), possibly blocking any future attempt to find the resource.
Because the failing SSCP may not be the resource owner, the resource
may be available and could be found if the search was allowed to continue
through the adjacent SSCP table.
The IOPURGE start option
can be used to specify how long VTAM will wait for a response before continuing a search. After
a specified time interval, if a response has not been received, VTAM continues its search through
the adjacent SSCP table until it either finds the resource or the
table has been exhausted.
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