Formula for calculating the number of tracks and cylinders

rksenthil2003 · New User Joined: 01 Jun 2007 Posts: 7 Location: Chennai

Hi

I have to allocate space for a file which contains 550 million records, each of LRECL = 130.

Is there any formula for calculating the number of tracks and cylinders required?

Regards
Senthil.

murmohk1 · Posted: Mon Jul 02, 2007 6:10 pm

Senthil,

rksenthil2003 · New User Joined: 01 Jun 2007 Posts: 7 Location: Chennai

Murmokh1,

Is there any SPACE calculation procedure in general?

murmohk1 · Posted: Mon Jul 02, 2007 6:29 pm

Senthil,

dick scherrer · Posted: Mon Jul 02, 2007 8:35 pm

Hello,

Yes, you can calculate the space required with some arithmetic.

If you want an estimate of the space needed, take a look at
http://ibmmainframes.com/viewtopic.php?t=21546
and
http://ibmmainframes.com/viewtopic.php?t=12634
to see if they help.

If there are still questions, please let us know.

expat · Posted: Mon Jul 02, 2007 10:37 pm

Mmmmmmmmmmmmmmmmm, assuming that the file is FB and you use optimum blocking for 3390, you will need in excess of 85,000 cylinders.

As was mentioned before, are you sure that you want to use DASD ???

That's just under 10 3390 model 9's

dick scherrer · Posted: Tue Jul 03, 2007 1:02 am

Hope we don't have to sort it. . . .