JES3 does device allocation before the job is allowed to run. For
tape drives it grabs the needed number of drives so you do not run
into "Waiting for a Drive" issues. It did the same back in the
mountable DASD days. I think it also tracks Tape Volumes so you do
not run into "I need Volume X" but another job is current using it
issues. IOW: It insures that once a job is allowed to start, there
will be no delays to gain access to the devices and files it needs.
At 17:54 +0000 on 01/22/2016, Gibney, David Allen,Jr wrote about Re:
Compile error:
I've never worked with JES3. What does it offer in "disk and tape
control" that DFSMS doesn't? Or, are we talking a different kind of
control?
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU]
On Behalf Of Skip Robinson
Sent: Friday, January 22, 2016 9:45 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Compile error
As we saw in the recent thread on converting from JES3 to JES2,
JES3 from the
beginning provided function--especially in the area of data device control--
that was never envisioned for JES2. I think that most of the recent
convergence of function in the two products mostly involves what we think of
as classic 'job control'. And the motivation for much of that
convergence is to
'elevate' function from JES to the BCP so that code has to be developed only
once. JES3's historic foray into disk and tape control, while
useful for shops
that make use of it, has little to do with 'controlling jobs' in
the original sense.
.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
323-715-0595 Mobile
jo.skip.robin...@att.net
jo.skip.robin...@gmail.com
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-
m...@listserv.ua.edu]
> On Behalf Of Staller, Allan
> Sent: Friday, January 22, 2016 09:02 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: [Bulk] Re: Compile error
>
> <snip>
> Meanwhile there did emerge a 'JES3', but it was not an evolutionary
> descendant of JES2. Both products have coexisted, albeit uneasily, for
decades.
> We used to imagine a JES5 or JES6 (depending on one's arithmetic
proclivity)
> that would somehow combine the best features of both products, but it's
> almost certainly DOA. ....
> </snip>
>
> Actually this seems to be happening. Witness the recent merging of JES3
and
> JES2 capabilities. 8 char job classes in JES2, JES2/JES3 using common
SAPI.
> SDSF (formerly JES only) obtaining JES3 capabilities.
> Dependent Job Control language in JES2 (2.2).
>
> And I am sure there are others. It looks like IBM is attempting to create
"THE
> JES" from the capabilities of JES2 and JES3.
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