Victor, Yes this JCL will allocate three tape drive units. DEFER only delays mounting the volume until open. The device is still allocated whether you open the dataset on the volume or not.
If your DFSMSdss job has three separate copy or dump statements that open each of the tape files then you can use UNIT=AFF. Otherwise you could break this into three separate jobsteps. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Victor Zhang > Sent: Thursday, August 21, 2008 8:11 PM > To: [email protected] > Subject: [IBM-MAIN] Deferred mount and device allocation > > Hi experts, > One question regarding tape deferred mount and device allocation, > supposing > following JCL statements: > //STEP1 EXEC PGM=ADRDSSU,REGION=6144K > //SYSPRINT DD SYSOUT=* > //ODOC1 DD DISP=NEW,DSN=TEST1.FILE1, > // LABEL=(1,SL),UNIT=VTAPE,RETPD=3,VOL=(,,,255) > //ODOC2 DD DISP=NEW,DSN=TEST1.FILE2, > // LABEL=(1,SL),UNIT=VTAPE,RETPD=3,VOL=(,,,255) > //ODOC3 DD DISP=NEW,DSN=TEST1.FILE3, > // LABEL=(1,SL),UNIT=VTAPE,RETPD=3,VOL=(,,,255) > > Will JES2 try to allocate 3 tape deivces even the datasets are > deferred to > mount(which is default when using stk vtss)? How to delay device > allocation > before it is actually be opened? > > Regards > Victor > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
