In [EMAIL PROTECTED], on
09/21/2005
at 10:34 AM, McKown, John [EMAIL PROTECTED] said:
Thanks for the pointer. The explanation is fairly high level, with no
implementation details. However, it appears that in the past
(pre-z/OS 1.3), the page data sets were simply initialized by filling
them
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Glenn Miller
Sent: Tuesday, September 20, 2005 9:01 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: Curiousity: format of an unused page dataset?
John,
Take a look at APAR OW55297
OK, I'll admit that I'm sort of goofing off on this one. I was curious
about the initial format of a never used page dataset. It appears to be
quite simple except for one thing. What I have determined is:
1) The entire dataset is formatted into 4K physical block. This makes
sense.
2) Every block
It's even sillier on VM.
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John,
I think you have it correct. The second block has a timestamp.
I wrote a program to read the first record of the PLPA and had to change
it to read the
second page (see below) to report on the creation date/time of the PLPA.
Used it to verify a CLPA really got done at IPL time.
The
John,
Take a look at APAR OW55297 on IBMLINK. It has a high-level description of
what you're
seeing on the Page Datasets. It also has references to other manuals.
I printed the 1st block for a couple of my Page Datasets ( they were
formatted by a z/OS R4
system and are being used by active
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