Perhaps the citation looked for is:
=
SPEED|RECOVERY
Specifies whether the data component's control areas are to be preformatted
This parameter is only considered during the actual loading (creation) of a
data
set. Creation occurs when the data set is opened and the high-used RBA is
equal to zero. After normal CLOSE processing at the completion of the load
operation, the physical structure of the data set and the content of the
data set
extents are exactly the same, regardless of which option is used. Any
processing of the data set after the successful load operation is the same,
and
the specification of this parameter is not considered.
If you use RECOVERY, the initial load takes longer because the control areas
are first written with either empty or software end-of-file control
intervals.
These preformatted control intervals are then updated, using update writes
with the data records. When SPEED is used, the initial load is faster.
SPEED
Does not preformat the data component's space.
If the initial load is unsuccessful, you must load the data set again from
the beginning because VSAM cannot determine the location of your last
correctly written record. VSAM cannot find a valid end-of-file indicator
when it searches your data records.
RECOVERY
Does preformat the data component's space prior to writing the data
records.
If the initial load is unsuccessful, VSAM can determine the location of the
last record written during the load process.
=
Don
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU]
On Behalf Of Mike Schwab
Sent: Monday, June 03, 2013 6:39 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Citation for reformatting of VSAM, HFS and zFS data sets
I went through the z/OS 1.13 manuals on defining VSAM datasets, but
even where the internal pointers were mentioned, it didn't say each CA
and CI was written as empty when defined. Just explained what was
there in each CI.
On Mon, Jun 3, 2013 at 1:29 PM, Shmuel Metz (Seymour J.)
shmuel+ibm-m...@patriot.net wrote:
I am editing a wiki article on disk formatting and have been
challenged to provide documentation of my claim that formatting a VSAM
cluster, HFS or zFS rewrites existing data. I could cite dead tree
documentation for VSAM in OS/VS2 R3.8, but I'd really prefer something
recent enough to be available online, preferably current, and that
wouldn't include the Unix file systems. I would appreciate it if
someone could add appropriate citations to
http://en.wikipedia.org/wiki/Disk_formatting or give me the links so
that I can do so. Thanks.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see http://patriot.net/~shmuel/resume/brief.html
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it all?
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