"Steve Comstock" <[EMAIL PROTECTED]> wrote in message
news:<[EMAIL PROTECTED]>...
> John P Kalinich wrote:
> >                         CKD DEVICES
> > 
> >                DATA  ALT  TRACKS/  BYTES/   BYTES/       BYTES/
> > DISK TYPE      CYLS  CYLS   CYL    TRACK     CYL         MODULE
> > 3390-54       65520    0     15    56,664   849,960 55,689,379,200
> > 
> 
> Thanks, John. That's what I was hoping to see.
> 
> Can you tell me where you found that?
> 
> Kind regards,
> 
> -Steve Comstock
> 

IBM APAR OA07687, one of several required for -54 support, says

* PROBLEM DESCRIPTION: New function support for the IBM *
* TotalStorage DS6000 and DS8000 *
* servers ( D/T1750 D/T2107 ) along *
* with the IBM TotalStorage ESS *
* D/T2105 model 800. *
* *
* This APAR provides DFSMSdss support *
* for up to 65,520 cylinder sized *
* volumes configured on these machines. *



Take notice of the following consequences:

Because the cylinder number in CCWs is 2 bytes, this is the max you can 
go in 3390 format (actually you could go to FFFF, but IBM chose to 
reserve a couple of cylinders. This support required that all IBM code, 
vendor code and user code change to treat the cylinder number as an 
UNSIGNED halfword. The previous largest disk was a 3390-27, 32760 
cyliners (X'7FF8') which still alowed the cylinder number to be a signed 
halfword. 


Kees.


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