Don:
Sorry to say that there are still (to this day) datasets (SAS) comes
to mind.
I (Long ago) opened a problem with them asking that they at the
minimum change it to dsorg=dau (direct access unmovable) but got the
stupid ass reply well it moveable if you use sas. SIGH... I gave up
and did a campaign in the company that if you used sas do not create
sas db's. I got a willingness to comply but we dropped SAS ($$ and
other issues) so it really didn't make a whole lot of difference.
Ed
On Jan 9, 2013, at 5:59 PM, Don Williams wrote:
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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