The existing scheduling software relies on the existing JCL processing; deploy a new paradigm and everybody needs to start from scratch.
Checkpoint/restart used to be common for large number crunching jobs and large tape jobs; how many production jobs these days match either profile? Most shops I've seen in the last few decades are doing some sort of random access processing. Transaction oriented restart seems a lot more relevant for modern workloads. I've occasionally used step restart, but as with C/R, an awful lot of work doesn't match its use case. You really don't want to wind up running some of the transactions twice. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [[email protected]] on behalf of John McKown [[email protected]] Sent: Tuesday, December 22, 2020 7:01 PM To: [email protected] Subject: Re: Build and submit proc On Tue, Dec 22, 2020 at 5:56 PM Seymour J Metz <[email protected]> wrote: > > IMO, you could replace all your JCL with REXX code. > > You'd have a hard time with scheduling if you tried that. > > > But then the programmer needs to be a REXX expert > > Why? Most users aren't JCL experts. Besides, in some ways REXX is simpler. > I agree, but CA-7 & CA-11 do the "hard lifting" for the staff WRT to scheduling & restarting. Hopefully after a programmer has fixed whatever caused the initial problem. > > > Hum, how do the Windows experts "restart" a "job" that fails? > > How does z/OS? There are stringent limitations on checkpoint restart. Step > restart is less constrained but not always appropriate. > Does anybody actually use that? In 40+ years, I've never seen it used. Perhaps because I've never been in a really large shop. I was thinking of CA-11 which tracks a job & allows restarting easily by a production control type person (likely not a programmer). > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
