Well, yes, but we should get the book right. So do you mind telling me
what the actual volume size is, just to confirm?
Reichman Joseph wrote:
It is the first half word of each has to be
Joe Reichman
Joe Reichman
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-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of John Eells
Sent: Thursday, July 21, 2016 2:35 PM
To: [email protected]
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...
Reichman Joseph wrote:
7.2.15 Marked DEVTYPE- info form from DFSMSdfp "Advanced Services" z/os
V1R10.0
Joe Reichman
Joe Reichman
IT Specialist
Master Files Division
New Carrollton Federal Building, B7-182 OS:CTO:AD:CP:I:IB Flex
M,T,Th,F Home office (240) 863 - 3965 Office (240) 613-4350
Cell (917) 748-9693
TOD M - F 7:30 am - 4:00 pm
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]]
On Behalf Of Elardus Engelbrecht
Sent: Thursday, July 21, 2016 12:52 PM
To: [email protected]
Subject: Re: DEVTYPE INFO=DASD
Reichman Joseph wrote:
The doc says bytes 0 - 3 is cylinders bytes 0 -3 is FFF00000 and
bytes 4 - 7 000FF000 is tracks per cyl ? am I misreading
misunderstanding the documentation
What docs? Could you be kind to give us the URL of that source of above info
and docs?
I was looking for the capability on a dasd device DEVTYPE
(R6),(AREA,L'AREA),INFOLIST=ILIST2
ILIST2 DEVTYPE INFO=DASD
AREA DS XL16
Hmmm, interesting application of that useful macro. I must try out
this little gem next week on my z/OS v2.1 sandbox when I'm returning
to my bread and butter work... ;-)
This was the data returned in area R15 = 0
FFF00000 000FF000 00000100 08000000
On what z/OS level were you trying to try out that Assembler snippet? How did
you obtained the contents of that R15? Via a dump or a MVC or something else?
Mike Schwab wrote:
FFF00000 000FF000 00000100 08000000
x'FFF0' would be 65520 cylinders. x'000F' would be 15 tracks per cylinder.
Reasonable for a 3390-54.
<snip>
--
John Eells
IBM Poughkeepsie
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