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
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Reichman Joseph
Sent: Thursday, July 21, 2016 3:09 PM
To: [email protected]
Subject: Re: DEVTYPE INFO=DASD
I just got word from Jay Campbell that the device capability is 17,974 cyls I
am getting back X'FFF0' or 65,520, Since he is in touch with IBM I would
suggest you contact him
Thanks
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 John Eells
Sent: Thursday, July 21, 2016 2:42 PM
To: [email protected]
Subject: Re: DEVTYPE INFO=DASD
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
>
> 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 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
> [email protected]
>
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--
John Eells
IBM Poughkeepsie
[email protected]
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