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Diffrence between physical tape and virtual tape.

 
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amitkumar_sindhi

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Joined: 20 May 2005
Posts: 8

PostPosted: Mon Aug 15, 2005 5:39 pm    Post subject: Diffrence between physical tape and virtual tape.
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I want to know what is the difference between physical tape and a virtual tape? Which is better and why?

regards,
Amit
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die7nadal

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Joined: 23 Mar 2005
Posts: 156

PostPosted: Mon Aug 15, 2005 9:35 pm    Post subject:
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I wud answer from the programmers perspective, I hope u meant Tape drives by saying 'Tape'. A Virtual Tape drive emulates the physical tape drive. This was introduced to overcome the shortage of physical tape drives as they were costly.

If a job accesses a huge number of tapes silmultaneously, u wud have coded the JCL to have DD DSN=TAPE,UNIT=AFF=DDNAME to retain the Drive used by a previous DDNAME. But now after the Virtual tape u wud have sufficient drives and u dont have to use the same drives again and again. Ofcourse the Physical tape drive is faster, but that is insignificant compared to it ROI. For a detailed architecture visit http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/FRAMESET/EZ3CAH00/CCONTENTS?DT=19990412142331
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