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vasanthz

Global Moderator

Joined: 28 Aug 2007
Posts: 1562
Location: Chennai

 Posted: Tue Aug 31, 2010 3:31 pm    Post subject: DASD Measure conversion. 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,

enrico-sorichetti

Senior Member

Joined: 14 Mar 2007
Posts: 10478
Location: italy

Posted: Tue Aug 31, 2010 7:13 pm    Post subject: Reply to: DASD Measure conversion.

 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
Bill Dennis

Active Member

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

 Posted: Tue Aug 31, 2010 7:18 pm    Post subject: 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
vasanthz

Global Moderator

Joined: 28 Aug 2007
Posts: 1562
Location: Chennai

 Posted: Wed Sep 01, 2010 10:47 am    Post subject: 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.
dick scherrer

Site Director

Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

Posted: Wed Sep 01, 2010 7:37 pm    Post subject: Reply to: DASD Measure conversion.

Hi Vasanth,

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

Thanks,

d
vasanthz

Global Moderator

Joined: 28 Aug 2007
Posts: 1562
Location: Chennai

 Posted: Wed Sep 01, 2010 8:48 pm    Post subject: 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 Warm Regards,
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