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- Problem statement
- A session ended unexpectedly and either no message is received
or an exception request (EXR) with a sense code of 800A0000 flows
to the destination LU.
- Common symptoms
- Upon receiving the sense code 800A0000, the LU might return the
code in a response. Some LUs will include the code in an UNBIND.
- Probable cause
- If a path information unit (PIU) is too large to be passed from
one PU type 4 or type 5 to another, an exception request (EXR), containing
sense code 800A0000 and up to 3 bytes of the RU, may be generated.
See Table 1 to determine what document
describes the building of the EXR.
- User response
- For VTAM® and NCP nodes
in the session path, check the following definition values for each
configuration used:
- VTAM to channel-attached
NCP: VTAM will take the smaller
of the following two values:
- MAXDATA value on the PCCU definition statement (or on the LINE
definition statement for a channel-attached NCP).
- Value sent in the XID of the maximum PIU size for the NCP. This
number will be the product of the BFRS value from the BUILD definition
statement and the TRANSFER value from the channel adapter LINE definition
statement for 3745 or 3720 with V5 NCP or from the BUILD definition
statement for other NCPs.
- Channel-attached NCP to VTAM:
The product of the MAXBFRU value from the HOST definition statement
(or from the LINE definition statement for a channel-attached NCP)
and the IOBUF size from the VTAM start
options. This value will be the maximum size that can flow from the
NCP to the host.
- VTAM-to-VTAM connection across a channel-to-channel interface:
- If both VTAMs have the CTCA enhancement: The product of the MAXBFRU
value from the CTCA LINE definition statement and the IOBUF size from
the VTAM start options.
- If one or neither of the VTAMs has the CTCA enhancement: The product
of the MAXBFRU value from the LINE macro and the IOBUF size from the VTAM start options.
- NCP to link-attached NCP: The product of the TRANSFR value on
the LINE definition statement and the BFRS value on the BUILD definition
statement.
- NCP to link-attached VTAM:
The product of the MAXBFRU value from the CA LINE definition statement
and the IOBUF size from the VTAM start
options.
Note: - The definition statements for all PU type 4 or type 5 nodes on
the session path must be checked, because any PU type 4 or type 5
can change the PIU into an 800A0000 exception request.
- The information in this problem description is from information
APAR II03990.
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