Gil:
See my previous reply. The DEB exists in the LSQA of the address space
that has the data set OPEN. In order to do what you ask, it would be
necessary for the system to find all OPEN instances of the newly
extended data set and then adding the new extent to its particular DEB.
How it would determine which address spaces have the data set OPEN
without using GRS' Queue elements for that data set (which you affected
by the DEQ), I don't know.
You could partially solve the problem by holding DEBs in global storage,
such as SQA, but this causes problems with the "DEB's appendage exit
list" which provides for application specific exits associated with the
use of the data set. Trying to make these global in scope would pose
some problems, in particular, it opens up an integrity exposure (based
on the DEB appendages) that was closed back in the first couple of years
that MVS was in existence.
Mike Myers
Mentor Services Corporation
Paul Gilmartin wrote:
On Thu, 15 Nov 2007 15:53:49 -0600, Mark S. House wrote:
During SMP/E mantenance a system fils CSF.SCSFMOD0 had a d37. I removed
the file from the PLEX and wanted to increase it's size. It appears the
LLA and XCFAS on the on the other LPAR's in the system have enque on the
name. How can I remove the enqueue so I can increase and copy the file.
Long ago, I encountered a technique, with DYNALLOC, to create a data
set while another job holds a SHR ENQ on its DSN. I reported this
in a PMR to IBM which struggled long and earnestly with the problem,
and concluded it was too hard to fix, and presented a nuisance but
no hazard. AFAIK, the behavior remains unchanged.
-- gil
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