I sent in an RCF this morning with what I thought the book should say,
and copied the lead DADSM/CVAF developer (to make sure my correction
does not inject some different problem!).
Bill Godfrey wrote:
I think the possibility should be considered that the OP may have mistakenly
been looking at the 16 bytes at AREA+2, not AREA. If that happened, and the
missing bytes are hex 0000, the results would be correct for a device with
65520 cylinders.
Bill
On Thu, 21 Jul 2016 14:30:41 -0500, Mike Schwab wrote:
Volume Data
Tracks . : 982,800
/ 15 = 65,520 = X'FFF0'
On Thu, Jul 21, 2016 at 2:17 PM, Campbell Jay <james.l.campb...@irs.gov> wrote:
Agree with John.
Doc should say first halfword of bytes 0 - 3 & 4 - 7.
MJI2 e . : IM404A
Command ===>
Unit . . : 3390
Volume Data VTOC Data Free Space Tracks
Cyls
Tracks . : 982,800 Tracks . : 360 Size . . :
269,730 17,974
%Used . : 72 %Used . . : 1 Largest . :
67,950 4,530
Trks/Cyls: 15 Free DSCBS: 17,892 Free
Extents . : 36
Disclaimer: No idea what he's working on
Jay Campbell
IBM OS Support Section
<snip>
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@listserv.ua.edu]
On Behalf Of John Eells
Sent: Thursday, July 21, 2016 2:35 PM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: DEVTYPE INFO=DASD
I think I understand your confusion. I'm not sure why you're using the z/OS
V1.10 level of the book. But in any event, the current (V2.2) level of the
book says this returns, for INFO=DASD:
Returns 16 bytes as follows:
Bytes 0-3 - Number of cylinders on the device, excluding alternates.
<snip>
Bytes 4-7 - Number of tracks per cylinder.
So one would reasonably expect x'FFF00000' to be the number of cylinders, and
x'000FF000' to be the number of tracks per cylinder. The values of the first
halfwords in each word, however, seem far more reasonable (possible, even!).
The correct number of tracks/cylinder is definitely 15.
But what is the actual size of the volume? You can use "V" on ISPF
OPT3.4 to see VTOC information, including the volume size in tracks under "Volume
data" on the left. Divide by 15 to get cylinders. What do you see?
It's likely RCF time...
<snip>
--
John Eells
IBM Poughkeepsie
ee...@us.ibm.com
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