On Wed, 21 Jan 2015 15:09:38 +0000, Bob Shannon <bshan...@rocketsoftware.com> 
wrote:


>>I think there are not special considerations with model 27 or model 54.Those 
>>dasd are just 3390-9 devices with a bigger size. 
 
>Correct. You aren't limited to Mod 27s or Mod 54s. As an example one can 
>define a Mod-15. The "mod" is based on the size of the volume. Anything GT a 
>>Mod-9 and LT a Mod-54 will work. GT a Mod-54 requires EAV. 

These days, I'd agree with that 99% of the time.  All vendor software was 
updated years ago to support
sizes > 32K CYL, but there could be some home grown code or old software 
floating around that could
have a problem with something bigger than a 3390-27.      

Mark
--
Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS  
ITIL v3 Foundation Certified   
mailto:m...@mzelden.com                                       
Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html 
Systems Programming expert at http://search390.techtarget.com/ateExperts/
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