I agree. My definition of "minor change" is a change that does not
affect the application's logical view of the file as seen through its
access methods. Some types of change might be "minor" for one
application, whereas the same type of change for a different
application would be catastrophic.
Of course, I need to understand how the application accesses its
files, in order to succesfully make these kinds of "minor
changes". So
I would love it if I could use HSM recall to do that.
I can remember a stone-age application that required its master file
to be a specific size on a particular volume at specific location on
that volume.
Hopefully, all applcations like that are long dead and gone.
Nowdays, most (but not all) applications are written to be
independent
of the CISZ or BLKSIZE, therefore changing the CISZ or BLKSIZE makes
no logical difference to the application. For an application that
uses
standard access methods, even changing the file from non-EA to EA
should make no logical difference.
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-
[email protected]]
On Behalf Of R.S.
Sent: Wednesday, January 09, 2013 5:53 PM
To: [email protected]
Subject: Re: ESDS extent ...
W dniu 2013-01-09 22:53, Don Williams pisze:
The HSM manuals do not clearly state that the objective of HSM is to
re-create the dataset as it was previously created. For example,
with
the right options a HSM recall can convert a SMS-managed data set to
non-SMS-managed and vice versa (with some restrictions, of
course). I
agree that some changes like making the LRECL smaller or converting
from/to EBCDIC to/from ASCII would destory data. However, HSM could
be designed to perform useful minor format changes during a
recall. I
would love it, if HSM had recall options to change the primary and
secondary allocation quanities, non-EA to EA, change blksize or
cisize,
etc.
Well, it depends on definition of "minor change". ExtFmt, CISZ,
BLKSIZE are NOT minor changes in my understanding because they change
format of
*existing* data. There are aplications CISZ or BLKSIZE dependent, Ext
Fmt
*is* physically different, etc.
SMS-managed or not does not affect the data itself.
--
Radoslaw Skorupka
Lodz, Poland
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