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In article <8907271812.AA19235@jade.berkeley.edu> b <mailrus!jarvis.csri.toronto.edu!utgpu!attcan!bdofed!cook@TUT.CIS.OHIO-ST> writes:
| [...]
|The JES2 proc is;
|
|//JES2    PROC MEMBER=JES2PARM,ALTMEM=JES2PARM
|//IEFPROC EXEC PGM=HASJES20,DPRTY=(15,15),TIME=1440,PERFORM=9
|//PROC00   DD  DSN=SYS1.EBE.PROCLIB,DISP=SHR,DCB=BLKSIZE=20000
|//         DD  DSN=SYS1.PROCLIB,DISP=SHR
|//         DD  DSN=OKPROD.PROC,DISP=SHR,UNIT=SYSDA,VOL=SER=EBE013
|//         DD  DSN=OKPROD.MSPROC,DISP=SHR,UNIT=SYSDA,VOL=SER=EBE013
|//         DD  DSN=PROD.PROCLIB,DISP=SHR,UNIT=SYSDA,VOL=SER=EBE007
|//         DD  DSN=TEST.PROCLIB,DISP=SHR,UNIT=SYSDA,VOL=SER=EBE005
| [...]
|All of the proclibs are PRIMARY allocation only. Their blocksizes are (in
|order) 3120, 3120, 3120, 3120, 6160, 6160.

	I think you should be saying  "DCB=BUFLEN=20000" on the
	//PROC00 line.

	Changing the BLKSIZE will indeed cause i/o errors since
	the read will expect 20000 bytes but will only get 3120
	whenever a SYS1.EBE.PROCLIB block is accessed.

Cheers,
-- 
   __	 Bruce Becker	Toronto, Ont.
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_<  >_	 "Mistah Kaldis, he T*d" - A Popsicle Now