<snip> The case I know best is JES2, which now includes tasks JES2AUX and JES2MON. The classic single-task JES2 problem was a hang on one member of a MAS. All other systems complained about access to the checkpoint, while the hung system couldn't even respond to simple commands. It's hung, after all. A second address space--which is designed to depend on minimal resources--is in a better position to analyze and report on the problem, perhaps allowing recovery short of killing the wounded guy. </snip>
It is very rare for an address space to be hung. More typical is that a task is hung. Multi-tasking in one address space can be an answer to being exposed to a problem in a single task. Using multiple address spaces is more typically related to the amount of data isolation that is desired. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
