If a JES2 member experiences an unrecoverable error during the reconfiguration dialog, or if you reply ‘TERM’ to a dialog message while processing an I/O error, JES2 attempts to create an emergency copy of the checkpoint data set. JES2 then issues message $HASP279 SPECIFY EMERGNCY CKPT VOLUME SERIAL OR ‘*NONE*’ to which you can specify a volume on which to place this data set. (JES2 can only create an emergency data set on DASD.) If JES2 is successful, JES2 names this data set SYS1.EMERGNCY.HASPCKPT. You then receive message $HASP274 SYS1.EMERGNCY.HASPCKPT CREATED ON VOLUME volser before JES2 termination. This data set can then be used when restarting JES2 on an all-member warm start.

When you respond to $HASP279 requesting that JES2 create an emergency checkpoint, IBM® suggests that you minimally create an emergency checkpoint from the driving member(s).