Receiving message CA-7.947 - ERROR READING CHECKPOINT ID RECORD during CA7 Release 12.0/12.1 startup.
The message CA-7.947 - ERROR READING CHECKPOINT ID RECORD is referencing the Checkpoint file which is pointed by the UCC7CKPT ddname.
Basically, this message means that CA 7 can't find the correct addresses for the checkpoint & queue files SCRQ and DQTQ.
As in our Best Practice Guide, we require that the queue files and the checkpoint file must reside on the same device type when not using VIO for SCRQ and DQTQ.
If this checkpoint file (UCC7CKPT) is new, a Start TYPE=CKPT should be performed the first time.
When something is changed (copied/new allocated..) into the checkpoint file, it is OK to start the first time with TYPE=CKPT.
The TYPE=CKPT is the same as TYPE=ERST but in addition :
The checkpoint file re-initialization causes the following actions:
As general description, the Checkpoint data set records checkpoints for restart purposes and it must reside on the same device type as the queues (remained in r12.0/r12.1).