Well, you could support BackupScripts.com by clicking ordering from their
Amazon Store:
www.amazon.com/exec/obidos/ASIN/0471227145/nbucentral-20/104-4744746-2294366
Or just go to amazon.com or wiley.com.
David
Quoting "Fisk, Nathan (ROC)" <Nathan.Fisk AT roc.celltechgroup DOT com>:
> Ooo. Where can I buy this book when it comes out?
>
> -Nate
>
> -----Original Message-----
> From: David A. Chapa [mailto:david AT datastaff DOT com]
> Sent: Thursday, June 05, 2003 9:34 AM
> To: Yosifovski, Tammy
> Cc: 'Joost Mulders'; Veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Tape Predictions for Transaction Logs
>
>
> It not silly.
>
> There is a chapter in Implementing Backup and Recovery that Dave Little and
> I
> just finished writing that illustrates how to plan your tape capacity. It
> should be easy enough to translate those formulae into trans log only
> equations.
>
> Unfortunately I am not at liberty to send you those pages right now as the
> book
> should be coming out this month...but the equations work...but as you
> mentioned
> there are a lot of variables to consider...so in the interest of simplicity
> we
> didn't introduce combined D-INC and C-INC backup equations but based on
> D-INC
> only or C-INC only...if you get the book you'll understand what I'm talking
>
> about. Anyway, I can't take credit for the equations, I enlisted the help
> from
> my brother who's got an under grad in Mathematics, Masters in EE and a PhD
> in
> Imaging Science. So I trust his work.
>
> David
> -------------------------------------<
> David A. Chapa
> DataStaff, inc.
> 312 683 1144
> mailto:consult AT datastaff DOT com
> http://www.datastaff.com
>
> Co-Author:
> Implementing Backup and Recovery:
> The Readiness Guide for the Enterprise
> published by John Wiley and Sons
> A Veritas Solution Series Publication
> ISBN:0471227145
> -------------------------------------<
>
> Quoting "Yosifovski, Tammy" <Tammy.Yosifovski AT usfc DOT com>:
>
> > Okay, Okay so my question is silly but doesn't anyone have to predict
> tape
> > usage to charge against a capital expenditure, before actually using the
> > tapes not after? I can easily do this for disk space but transaction
> logs
> > are a whole ballpark of its own.
> >
> >
> >
> > -----Original Message-----
> > From: Joost Mulders [mailto:mail AT j-mulders.demon DOT nl]
> > Sent: Wednesday, June 04, 2003 5:25 PM
> > To: Veritas-bu AT mailman.eng.auburn DOT edu; Yosifovski, Tammy
> > Subject: Re: [Veritas-bu] Tape Predictions for Transaction Logs
> >
> > >Does anyone have a mathematical formula for predicting tape usage for
> > >transaction logs? Any idea on how to do this for something like this
> that
> > >has so many variables?
> >
> > Hmm, let's see.
> >
> > ((X / (1024 ^3)) x Y) / Z) x W
> >
> > Whereas:
> > X = The number of bytes your db's generate for transactionlogs
> >
> > A nice estimation of X would be, the number of users connected
> > to your db x the number of keystrokes they do per day x their
> > intelligence factor divided by the coffee cocient, which is an index
> > for the quality of the coffee your company serves.
> > 0.1 is bad coffee. 1 is very good coffee. So 0 >= X <= 1
> >
> > Y = is your retention, expressed in days.
> >
> > Z = is the capacity of one tape, expressed in GB's.
> >
> > W = a factor expressing the quality of the backup admin.
> > W = 100 = Bad admin
> > W = 1 = Good admin
> > So, 1 >= W <= 100
> >
> > Sorry, couldn't help it. Nothing better to do :-)
> >
> >
> > --
> > You're to have, not to hold.
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
>
>
>
> _______________________________________________
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> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
>
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-------------------------------------<
David A. Chapa
DataStaff, inc.
312 683 1144
mailto:consult AT datastaff DOT com
http://www.datastaff.com
DataStaff is a principal sponsor of
BackupScripts.com
-------------------------------------<
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Co-Author:
Implementing Backup and Recovery:
The Readiness Guide for the Enterprise
published by John Wiley and Sons
A Veritas Solution Series Publication
ISBN:0471227145
-------------------------------------<
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