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bnveena
New User
Joined: 29 May 2007
Posts: 50
Location: hyderabad
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Hi ,
I want to know the length of a data set in Kilo bytes. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
Multiply lrecl * number-of-records and divide by 1024. |
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arunkumar atr
New User
Joined: 03 Dec 2008
Posts: 19
Location: Chennai
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Hi,
If u know the length of DS in tracks, then here is the solution..
1 track = 56 KB |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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| Quote: |
If u know the length of DS in tracks, then here is the solution..
1 track = 56 KB |
please post the reference where You found this misleading info 
even the original question is badly posed...
the disk space allocated to the dataset..
or the space used inside the allocation?? |
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PeterHolland
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Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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| arunkumar atr wrote: |
Hi,
If u know the length of DS in tracks, then here is the solution..
1 track = 56 KB |
That will depend on the disk device type.
Beside that on 100T-byte tape drives, the track size is about 10 microns  |
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arunkumar atr
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Location: Chennai
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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arunkumar atr
New User
Joined: 03 Dec 2008
Posts: 19
Location: Chennai
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Hi enrico sorichetti,
I got the following info from the link.... www.lascon.co.uk/d008003.htm
It says tat in 3390-3 volume, we have 55,996 usable bytes per track... |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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| Quote: |
| It says tat in 3390-3 volume, we have 55,996 usable bytes per track |
Your assumption is that all 55,996 bytes are usable for every file -- which is not true. If the file has fixed length records, and the record length is not 27998 or an even divisor of 27998, you will not be able to use all 55,996 bytes. And this assumes half-track blocking is being used -- other block sizes can reduce the amount of used space per track by 75-80%. |
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PeterHolland
Global Moderator
Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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| bnveena wrote: |
Hi ,
I want to know the length of a data set in Kilo bytes. |
Why would someone want to know that (the 1.000.000 dollar question)?
As far as i know nobody is interested in kilobytes, everybody computes space in tracks, cylinders, volumes etc.
Formulas enough to do that kind of computations.
Using DATACLASS makes it even easier, using a small DATACLASS for big
datasets or a large DATACLASS for a small dataset will bring the storage guys to your door in seconds with their baseball bats. |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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| Quote: |
| Why would someone want to know that (the 1.000.000 dollar question)? |
If the data set has to be transferred to another system (Unix or Windows based, for example), the size in KB could be relevant. |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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| will bring the storage guys to your door in seconds with their baseball bats. |
No, us storage guys are really nice people  |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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| Quote: |
| No, us storage guys are really nice people |
You say that NOW! |
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PeterHolland
Global Moderator
Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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The storage guys i know are my best friends (and yes after a lot of boozing is involved)  |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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| Robert Sample wrote: |
| Quote: |
| No, us storage guys are really nice people |
You say that NOW! |
Yeah, only because I've left my baseball bat at home today 
| PeterHolland wrote: |
| The storage guys i know are my best friends (and yes after a lot of boozing is involved) |
Yes, we are easily bribable - Mine's a Leffe blonde thanks  |
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