Don,
Please refer to 11.6.5 ACS routines invoked for restoring, recalling,
recovering, and
converting data sets in DFSMSdfp Storage Administration.
Table 11 clearly shows that Dataclass in not invoked by HSM Recall or Recover.
-----Original Message-----
From: Don Williams [mailto:[email protected]]
Sent: Wednesday, January 09, 2013 2:09 PM
To: [email protected]
Subject: Re: ESDS extent ...
When HSM (or equivalent product) recalls a data set, it has to allocate the
space on the primary DASD. That allocation will need data class attributes.
In my opinion, the HSM manuals are not clear how or where HSM gets the data
class attributes. I believe you, but it would be nice if the HSM manuals
clearly stated that the data class attributes of a recalled data set were
solely obtained from the migrated copy of data set and not from the current SMS
data class.
>From the z/OS V1R12.0 DFSMShsm Storage Administration manual:
============================================================================
=============================================
Chapter 54. RECALL command: Recalling a specific migrated data set
The RECALL command recalls a migrated data set. If you want, you can specify
the volume and type of unit where DFSMShsm is to recall the data set.
If you specify the volume and type of unit when recalling an SMS-managed data
set, the volume and unit type will be passed to the automatic class selection
(ACS) Routines. ACS ultimately determines to which volume the data set is
recalled.
The FORCENONSMS parameter allows the ability to force recall of an SMS-managed
data set to a non-SMS-managed volume. It is not possible to convert a data set
that is not extended format to a data set that is extended format during a
recall. However, you can convert an extended format data set to a data set that
is not extended format during a recall, if you specify the FORCENONSMS optional
parameter.
============================================================================
=============================================
Don Williams
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of R.S.
Sent: Tuesday, January 08, 2013 3:32 PM
To: [email protected]
Subject: Re: ESDS extent ...
W dniu 2013-01-08 21:26, Don Williams pisze:
> HSM Recall does not re-invoke the DataClas ACS routine (several years
> ago, I had to proof that to my teammates). Therefore a recalled data
> set will have the same data class name. Since a data class could
> affect many hundreds or thousands of data sets (we still have some
> applications that cannot handle extended data sets), I've never
> changed a data class from non-extented to extended then tried to
> recall the data set. It would be interesting to know if that would work.
It is not matter whether DC is called or not (it's not AFAIK). It's matter that
even changed DC does not affect existing dataset parameters.
It will not affect.
Caution: parameters like DVC can be changed dynamically, but actually DVC is
some "potential bahavior" not "actual shape" of the physical object.
Of course REPRO or EXPORT/IMPORT will change the EA parameter.
--
Radoslaw Skorupka
Lodz, Poland
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