I found the answer to my question.  In the SMS base config the Default device 
geometry is set up for 3380 instead of 3390 :
 
Default Device Geometry 
 
Bytes/track . . . . . : 47476
Tracks/cylinder . . . : 15   
 
This is causing the allocation to be reduced.  To bypass the problem I am using 
UNIT=3390 instead of UNIT=SYSALLDA.  Problem solved.
 
Thanks.

From: willie bunter <williebun...@yahoo.com>
To: "IBM-MAIN@listserv.ua.edu" <IBM-MAIN@listserv.ua.edu> 
Sent: Thursday, October 3, 2013 10:48:05 AM
Subject: SMS QUESTION - ACTUAL SPACE NOT ALLOCATED



Good Day All,

I am trying to allocate a dsn using PGM=IEFBR14 to create a dsn which of 25 
cylinders.  The dsn is SMS managed and it has GUASPACE as the Storage Class.  
The DC & MC are null.

The dsn is allocated on the volume as requested however the space allocated is 
20 instead of 25.  I was able to allocated the space of 25 cylinders when I 
coded UNIT=SYSALLDA,SPACE=(CYL,29),VOL=SER=PROM01.

Could anybody tell me where my error is?  Below is my jcl (which is run from a 
proc)

//*                                                            
//ALLOC    EXEC PGM=IEFBR14                                    
//A01065   DD  &A01.DSN=&DSNIN..A01065,DISP=(,CATLG),          
//             UNIT=SYSALLDA,SPACE=(CYL,29),VOL=SER=PROM01  
//IXX065   DD  &IXX.DSN=&DSNIN..IXX065,DISP=(,CATLG),          
//             UNIT=SYSALLDA,SPACE=(CYL,29),VOL=SER=PROM01     
//*                                                            

Below is the inquiry on the dsn:

Command ===>                                                                   
                                                                   More:     + 
Data Set Name . . . . : HEST.INTS.DATACOM.A01065                              
                                                                               
General Data                           Current Allocation                      
 Management class . . : **None**        Allocated cylinders : 25               
 Storage class  . . . : GUASPACE        Allocated extents . : 1                
  Volume serial . . . : PROM01                                                 
  Device type . . . . : 3390                                                   
 Data class . . . . . : **None**                                               
  Organization  . . . : PS             Current Utilization                     
  Record format . . . : F               Used cylinders  . . : 25               
  Record length . . . : 4096            Used extents  . . . : 1                
  Block size  . . . . : 4096                                                   
  1st extent cylinders: 25                                                     
  Secondary cylinders : 0              Dates                                   
  Data set name type  :                 Creation date . . . : 2013/09/27       
  SMS Compressible. . : NO              Referenced date . . : 2013/10/03       
                                        Expiration date . . : ***None***      

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