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Converting SIZE...

 
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new2cobol

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Joined: 04 Jan 2006
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PostPosted: Tue May 09, 2006 2:21 am    Post subject: Converting SIZE...
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How many 3390 cylinders make 1GB of space?
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superk

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Joined: 26 Apr 2004
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Location: Raleigh, NC, USA

PostPosted: Tue May 09, 2006 5:48 pm    Post subject: Re: Converting SIZE...
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My calculation comes up with approximately 1279 cylinders.
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new2cobol

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PostPosted: Wed May 10, 2006 2:56 am    Post subject:
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Can you tell me how you did it?
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superk

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PostPosted: Wed May 10, 2006 9:30 pm    Post subject: Re: Converting SIZE...
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I'm going to revise my original calculation slightly.

According to the Using IBM 3390 in an MVS Environment manual, Using the 3390 Track Capacity Table chart, the maximum number of bytes is 56,664 per track.

So, dividing 1GB (1,073,741,824 bytes) by 56,664 bytes/track = 18,950 tracks. There are 15 tracks per cylinder, so dividing 18,950 by 15 gives about 1,264 cylinders. I used a value of 55,996 bytes/track for my previous calculation, since it's not really possible to access every available byte on a track.
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