Paul Gilmartin wrote:
On Fri, 21 Aug 2009 16:04:46 +0200, Gilbert Saint-Flour wrote:
I hope the recently-updated Initiator knows that IEFBR14 is the 4-byte IBM
version, not a special utility program written locally and also called
IEFBR14, something I saw at-least once before.
Discussed here several weeks ago, when an IBM employee replied, no, it
doesn't know.
The MVS JCL was significantly enhanced in the late 1980s and early 1990s and I
wish a number of JCL-related HSM issues were solved at the time. Why did it
take 25 years to skip HRESTORE when PGM=IEFBR14 and DISP=(MOD,DELETE) ?
How many millions of HSM ML2 tapes had to be mounted for nothing ?
RESTORE? RECALL? Whatever.
And I tried an IEFBR14 with DISP=SHR,UNIT=(,,DEFER) (z/OS 1.7). The
data set was recalled regardless. Regrettable; not recalling until
OPEN would be good notional agreement with DEFER. I'm curious:
in days of yore, did DEFER actually defer mounting demountable DASD?
-- gil
I don't think anyone ever answered this.
DEFER did work for mountable DASD.
Mountable DASD allocation wasn't very smart though.
It always selected the first available drive
(not permanently mounted and not allocated).
At slow times, this could lead to a pair of disks
being repeatedly mounted on the same drive. ASP may
have modified this, I don't know, we never ran it.
I made a mod to store the time at unalloc, and at alloc
if the volume wasn't already mounted it would search for
an available drive with the oldest time stamp.
--
Richard
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