Errors on a spool data set cause problems in applications running on the system and for users. Checkpoint I/O errors will impact the system, unless the system runs in backup checkpoint mode. Symptoms of these errors are:

• I/O error messages indicate the spool or checkpoint data set.
• A printer rejects selected work and marks it non-selectable.
• JES2 displays the checkpoint reconfiguration dialog.
• JES2 issues $HASP095 message.
• JES2 issues $HASP096 message followed by $HASP185.
• JES2 issues $HASP289 message during JES2 initialization.
• JES2 marks jobs as non-selectable because of I/O errors when a JES2 processor selects work.