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Significance of using '55' in UNIT=(SYSALLDA,55)

 
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Sudeshna Sarkar

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PostPosted: Thu Aug 20, 2009 1:41 pm    Post subject: Significance of using '55' in UNIT=(SYSALLDA,55)
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Hi Friends,

Long time no see. Can you please help with this query?

//OCUSIP DD DSN=&WORK..ZEAD850B.BEAB850.CUSIP,
// DCB=(RECFM=FB,LRECL=496),
// &S1.UNIT=(SYSALLDA,55),SPACE=(CYL,(3,3),RLSE),
// DISP=(,CATLG,DELETE)
//*

can you please tell what is the significance of '55' with SYSALLDA(DASD)?
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enrico-sorichetti

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PostPosted: Thu Aug 20, 2009 2:46 pm    Post subject: Reply to: Significance of using '55' in UNIT=(SYSALLDA,55)
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the manual will tell in much better words icon_biggrin.gif
link to the manuals at top of the page
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Sudeshna Sarkar

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PostPosted: Thu Aug 20, 2009 3:37 pm    Post subject:
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Thanks a lot for the pointer, in this case it means the no of devices to be allocated, but still could not undertand whether no of devices mean the same as no of volumes to be allocated. Can we conclude that the file requires and so we are allocating 55 volumes for the same?

thanks a ton anyways!!!!111
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Anuj Dhawan

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PostPosted: Thu Aug 20, 2009 5:30 pm    Post subject:
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Sudeshna Sarkar wrote:
but still could not undertand whether no of devices mean the same as no of volumes to be allocated.
Did you mean, what's the difference between UNIT and VOL Parameter in JCL?
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expat

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PostPosted: Thu Aug 20, 2009 5:37 pm    Post subject:
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Well, as you can only have one vol on one device ................
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Sudeshna Sarkar

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PostPosted: Tue Aug 25, 2009 10:59 am    Post subject:
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Hi Anuj,

Well sorry for confusing, I just needed to know like how can i define the parameter '55' in the Unit parameter. What does it stand for? IS it no of devices? I am sure UNIT and VOL are 2 different parameters.

thnx again
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expat

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PostPosted: Tue Aug 25, 2009 11:35 am    Post subject:
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Take a look at the JCL reference manual - easily accessible from the IBM Manuals button at the top of each page.
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dick scherrer

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PostPosted: Tue Aug 25, 2009 7:13 pm    Post subject:
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Hello,

Quote:
I am sure UNIT and VOL are 2 different parameters.
Yes, they are. . .

Have you now read the info via the link suggested? Is it now clear?
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Anuj Dhawan

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PostPosted: Tue Aug 25, 2009 7:59 pm    Post subject:
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Sudeshna Sarkar wrote:
Well sorry for confusing, I just needed to know like how can i define the parameter '55' in the Unit parameter. What does it stand for? IS it no of devices? I am sure UNIT and VOL are 2 different parameters.
No need of sorry, we all have some ambiguous queries at times ... icon_smile.gif

  • The UNIT parameter identifies the type of device a data set is to reside on.
  • The UNIT parameter can also tell MVS how many devices to assign and to defer mounting the volume on the device until the data set is actually opened for processing.
So to answer your questions -- "55" stands for 55-number-of-devices.

As suggest earlier, please take a look at the JCL reference manual - easily accessible from the IBM Manuals button at the top of each page.
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