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DASD Measure conversion.

 
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vasanthz

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Joined: 28 Aug 2007
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PostPosted: Tue Aug 31, 2010 3:31 pm    Post subject: DASD Measure conversion.
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Hi,

Could you please let me know the precise conversion formula to convert a DASD measure - track days to DASD GB?
I was told that the formula was DASD GB = (track days / 400,000) * 0.63
Is this correct?

But this formula has a variance of exactly 2.88% from the correct number.
Correct GB space is 2.88% lesser than the GB derieved from the formula.

Please let me know your thoughts.

Thanks & Regards,
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enrico-sorichetti

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Location: italy

PostPosted: Tue Aug 31, 2010 7:13 pm    Post subject: Reply to: DASD Measure conversion.
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Quote:
Is this correct?

NO

the formula does not take in consideration the warp factor for rotating devices ( converted to radians obviously )
and/or the electron spin for the SSD ( solid state devices )

anyway the formula looks like plain bull**** to me

what is the genius trying to measure icon_question.gif icon_evil.gif
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Bill Dennis

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Joined: 17 Aug 2007
Posts: 562
Location: Iowa, USA

PostPosted: Tue Aug 31, 2010 7:18 pm    Post subject:
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I'm not sure what "track day" means.

Use the link below to see the number of records that fit on a track for various block sizes. Then divide into your total to see how many tracks you need.

IBM 3390 Capacities
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/am3u1001/B.1.2
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vasanthz

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PostPosted: Wed Sep 01, 2010 10:47 am    Post subject:
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Bill,
Thanks for your time responding. I did some more reading on the application manual and it appears that it is a custom measure used by a CA product.
The manual too said that DASD GB = (track days / 400,000) * 0.63 , so im fine with it.
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dick scherrer

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Joined: 23 Nov 2006
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PostPosted: Wed Sep 01, 2010 7:37 pm    Post subject: Reply to: DASD Measure conversion.
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Hi Vasanth,

Quote:
I'm not sure what "track day" means.
I too don't know what "track day" means. . . icon_confused.gif

Thanks,

d
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vasanthz

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PostPosted: Wed Sep 01, 2010 8:48 pm    Post subject:
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Hi D,

I too do not know what that term means, I assumed that it was a common DASD term and someone here might be knowing which I am not aware of..

After referring the CA-JARS manual I came to know that it was a terminology to represent DASD usage space.

Based on some understanding of the code,
If the DCVVLCAP - Volume capacity from DCOLLECT V type records is 15770 then track days is 6840

For DCVVLCAP of 16600 - TRKDAY is 7200
For 17430 TRKDAY is 7560 and so on...

There is a JARS table that defines specific TRKDAY values for specific volume capacities.

I thought it was a common term, my bad icon_sad.gif

Warm Regards,
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