Syncpoint Capabilities Supported by APPC/MVS

This section describes the level of sync point support that APPC/MVS supports in relation to the SYNCPT architecture.

An APPC LU negotiates the level of syncpoint support with a partner using the Exchange Log Name (X'1211') GDS Variable. The format of this record is documented in SNA Formats. The level of syncpoint support by an LU is expressed in one byte in the exchange log name GDS variable. The following is how APPC sets byte 5 of the Exchange Log Name (X'1211') GDS Variable:

Table 1. How APPC sets byte 5 of the Exchange Log Name (X'1211') GDS Variable
Bit	Value	Meaning
0	0	Does not support RECOVERY_LEVEL(RESTART)
1	1	The LU name of the creator of the conversation correlator is present in Compare States
2	1	Byte 2 of the PS header contains flags and X'08240001' sense code is accepted in FMH-7
3	0	Does not support presumed abort protocols
4	1	Supports PLNA protocols
5	1	Does not require partner log name validation on a warm start
6	0	Does not support extended capabilities
7	-	Not used for syncpoint capability negotiation