The Help panels say it can be overridden, but experimentation seems to
prove otherwise, unless I've missed something. 

My job:

//STEP1   EXEC  PGM=IDCAMS                                             
//SYSPRINT  DD SYSOUT=*                                                
//DDI     DD DISP=SHR,DSN=VAT.ALL.VA030V                               
//DDO     DD DISP=(NEW,CATLG),DSN=DPC088.VA30.DUMP,LRECL=300,RECFM=FB, 
//           SPACE=(TRK,(2,2)),UNIT=(SYSDA,1),STORCLAS=LOGRSC          
//SYSIN DD *                                                           
     REPRO IFILE(DDI) -                                                
           OFILE(DDO)                                                  
/*                                                                     

ACS routine points LOGRSC storclass to a pool with 4 volumes.  DEFAULT
dataclass includes a dynamic volcount of 12.

Result: 

NONVSAM ------- DPC088.VA30.DUMP                             
     IN-CAT --- CATALOG.SYSTEMS.USERCAT                      
     HISTORY                                                 
       DATASET-OWNER-----(NULL)     CREATION--------2007.193 
       RELEASE----------------2     EXPIRATION------0000.000 
       ACCOUNT-INFO-----------------------------------(NULL) 
     SMSDATA                                                 
       STORAGECLASS -----LOGRSC     MANAGEMENTCLASS---(NULL) 
       DATACLASS -------DEFAULT     LBACKUP ---0000.000.0000 
     VOLUMES                                                 
       VOLSER------------SMS003     DEVTYPE------X'3010200F' 
       VOLSER------------SMS004     DEVTYPE------X'3010200F' 
       VOLSER------------SMS001     DEVTYPE------X'3010200F' 
       VOLSER------------SMS002     DEVTYPE------X'3010200F' 
     ASSOCIATIONS--------(NULL)                              
     ATTRIBUTES                                              

Greg Shirey
Ben E. Keith Company 

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Mark Zelden
Sent: Thursday, July 12, 2007 8:41 AM

If so, then coding something like UNIT=(SYSALLDA,1) should
work.  JCL is merged with DATACLAS, but also overrides it. 

Mark

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