TAPEIO = BSAM | EXCP
This parameter identifies what the TAPEIO setting was prior to Version 5.0.
The default value is BSAM.
This parameter does one thing prior to Version 5.0 and something different afterwards.
Prior to Version 5.0, this parameter controlled what access method was used by the COPY function to read and write to tape, either BSAM or EXCP. When BSAM was specified, BSAM was used to read and write the tape, NOTE TYPE=REL was used to generate tape checkpoint records, and POINT TYPE=REL was used to set the tape restart point. When EXCP was specified, EXCP was used to read and write the tape, a channel command equivalent to NOTE TYPE=ABS was used to generate tape checkpoint records, and a channel command equivalent to POINT TYPE=ABS was used to set the restart point.
After Version 5.0, BSAM is always used to read and write to tape, NOTE TYPE=ABS is always used to generate new tape checkpoint records, and POINT TYPE=ABS is always used to set the tape restart point from new checkpoint records. The TAPEIO parameter is re-purposed and tells IBM® Connect:Direct® what the TAPEIO setting was prior to Version 5.0 so that it can switch to using POINT TYPE=REL when restarting using pre-Version 5.0 checkpoint records. This information is critical to the successful functioning of checkpoint restart if a tape is created by a IBM Connect:Direct prior to Version 5.0 and the restart attempted on or after Version 5.0. This includes checkpoint records stored in the local node's checkpoint dataset, as well as checkpoint records stored in a remote node's checkpoint dataset.
Thus, the TAPEIO parameter setting becomes irrelevant and can be removed once there is no possibility of restarting a tape COPY function using IBM Connect:Direct prior to Version 5.0.
Modifiable through MODIFY INITPARMS command: NO