Pommier, Rex wrote:
Hello list,
I have what are probably simple questions regarding the relaxation of the 255
generation GDG limit. We are running z/OS 2.2 so are eligible for the
relaxation. I know I need to make a change to the IGGCATx member to activate
the capability and I need to add EXT to the GDG definition. So here are my
(rather basic) questions.
1. Can I implement an IGGCATxx member short of an IPL? I don't have one now,
relying on the defaults, and I don't see anything in the INIT&TUNING manual
that indicates that I can implement this dynamically, sadly.
2. Once it is active, can I use an IDCAMS ALTER to change between the old limit and an
extended one? I am positive the answer to this is "no, it can only be done at GDG
definition time" but am hoping.
3. Here's the scenario that has led me to this point. We just discovered we have a tape
based GDG defined with LIMIT(255) and we have had several generations fall off the end.
This is data we need to recover. Presuming the answer to question 2 is "no" as
I strongly suspect, does anybody see an unsurmountable problem with (carefully)
uncataloging all the tape generations, redefining the GDG base as extended with an
appropriate limit, and recataloging all the generations, including the ones that have
fallen off?
<snip>
For (1), Managing Catalogs says, "The system applies IGGCATxx values at
IPL time as well as at the restart of the Catalog Address Space." You
can restart Catalog using F CATALOG,RESTART. Be aware that Catalog
operations will be suspended for a bit while that happens.
For (2), I don't see an ALTER keyword that would do that, nor the
Extended attribute (for GDGs) in the alterable attribute list, in Access
Method Services Commands.
For (3), I don't, but I'd want to try a test case or two first!
--
John Eells
IBM Poughkeepsie
[email protected]
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