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What does VTAPE mean in unit=Vtape

 
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raak

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Joined: 23 May 2006
Posts: 166
Location: chennai

PostPosted: Tue Feb 06, 2007 10:23 am    Post subject: What does VTAPE mean in unit=Vtape
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Hi,

In our system, we are using Unit=VTAPE for using Tape files. What does that V inVTAPE stand for? What is the purpose of it? is it different from ordinary tapes?



Thanks
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chtrisa

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Joined: 19 Dec 2006
Posts: 12
Location: chennai

PostPosted: Tue Feb 06, 2007 11:38 am    Post subject:
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hi raak,

go and read this pdf.

www.bustech.com/pdf/MAS-WP-11-15-06.pdf.
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dick scherrer

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Joined: 23 Nov 2006
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PostPosted: Tue Feb 06, 2007 8:30 pm    Post subject:
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Hi Raak,

VTAPE or V-Tape stands for Virtual Tape. This is a way to keep part of an organization's "tape" inventory on disk.

Many jobs have "tape" DD statements that would be better served if they were not on a physical reel/cart. V-Tape intercepts "tape" i/o for those files defined to the V-Tape system.

One choice would be to redo all of the jcl, but that is often too costly to do. Using V-Tape, all of the original jcl works as is and the switch is all done internally.

When you use V-Tape, a new series of "tape volumes" is defined to the V-Tape system and to the tape management system. These virtual tapes are processed just like the plastic ones.

Hi chtrisa - the posted link gets a 404 error
Quote:
We're sorry.
We have recently updated our Web site and the page you are looking for no longer exists. Please consult the site map below to find what you are looking for or contact us if you have any additional questions.

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Lance Revell

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Joined: 04 Feb 2007
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Location: Tallahassee, Florida USA

PostPosted: Tue Feb 06, 2007 9:35 pm    Post subject:
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This depends on the particular data center too. At mine, we use "TAPEC" for cartidges, but the volume serial determines whether a physical tape or a virtual tape. A five digit volser is a physical tape, while a six digit volser is automatically a virtual tape. Both are cataloged and function identically in the JCL.
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dick scherrer

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PostPosted: Tue Feb 06, 2007 9:55 pm    Post subject:
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Hello,

If your site adds a new generic for virtual tape it may be something like VTAPE.

You may not want to change all of your existing jcl to point to the new VTAPE. The virtual tape system is told which datasets are to be mounted on virtual tape drives which means existing jcl will work as is.

As Lance pointed out, they use TAPEC - the tape management system along with the virtual tape system know which pool of "tapes" to use. The physical tapes and the virtual tapes have separate tape pools. Again, as they do where Lance is - the pools should have unique and easily identified series of volsers.
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chtrisa

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PostPosted: Wed Feb 07, 2007 11:06 am    Post subject:
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sorry....i attached that pdf...
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