Excuse me, but IMHO RECOVERY does "format" CIs within CA - that means
proper values are written into CIDF and RDF (in any).
That means VSAM knows the CI is empty, or partially filled. Unused space
within CI is not cleared, there is no need for that.
From the other hand physically full block is written. PB is usually
equal CI (let's focus on this case), so everytime you write CIDF, you
write full block. The rest of block may be zeros or just any value, but
not previous content from the track.
So - it seems the goal of RECOVERY is to write control fields, but the
way its being done means whole CIs are rewritten.
IMHO nevermind, because both SPEED and RECOVERY do not "format" all
possible CI's within disk extent. So, even with RECOVERY it is possible
to have residual data within the extent. Still hard to read, but not
impossible.
--
Radoslaw Skorupka
Lodz, Poland
W dniu 15.05.2020 o 21:17, Mike Schwab pisze:
https://www.ibm.com/support/knowledgecenter/SSLTBW_2.4.0/com.ibm.zos.v2r4.idai200/da6i2118.htm
Discussion on Speed / Recovery option.
On Fri, May 15, 2020 at 5:34 PM Seymour J Metz <sme...@gmu.edu> wrote:
Do you have something that I can cite for that, preferably something that all
wiki readers can look at?
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Mike Schwab [mike.a.sch...@gmail.com]
Sent: Friday, May 15, 2020 1:14 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Does allocating an HFS or zFS erase all existing data?intervals
formatted?
All VSAM datasets including Linear are formatted when created. The
disk space used is not allocated to any other datasets. Previous data
left by deleted datasets is usually left in place (erase on delete is
an option but not used frequently) but frequently overwritten in a
short time so restoring a deleted data set is almost always
impossible.
On Fri, May 15, 2020 at 4:25 PM Seymour J Metz <sme...@gmu.edu> wrote:
I want to edit the wiki article [[Disk formatting]] to clarify the statement "s a
general rule,[nb 1] formatting a disk erases most if not all existing data on the disk
medium". Normally I would consult the logic manuals :-(
When you allocate an HFS or linear data set, does AMS preformat all of the
tracks? When you format a zFS, does that force formatting of all tracks? Can
you provide references that I can cite for the answers?
Thanks.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
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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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