Dan, your statement: 
"Or you can use dynamic files (although at the most - with a lot of luck - 
this gives you 4Gb)"
Is incorrect, we have dynamic files over 18gig in size without incedent, 
on Unidata. Unidata just keeps adding part files of 1gig each or less.

"Dan Fitzgerald" <[EMAIL PROTECTED]>
02/10/2004 04:12 PM
Please respond to U2 Users Discussion List
        To:     [EMAIL PROTECTED]
        Subject:        RE: 2 gig limits

The limit is an old one from Unix having 32-bit addressing. On a system 
32-bit addressing, the limit applied to all files, including backup images 

(at least to disk - I'm not certain about on tape drives, although I'd 
assume so). Now, we have 64-bit addressing, so the upper limit is in the 
pentabyte range. UniVerse and Unidata still have a default configuration 
parameter of 32-bit addressing. This parameter is easily changed to 64.

Currently, the cost associated with going to 64-bit addressing for 
& Unidata is the loss of a particular tool which is useful in repairing 
corruption, filepeek. File corruption is pretty rare, but not unheard of, 
especially as hardware fails. By going to a scheme like RAID0+1 with 
transaction logging, you probably won't miss (watch the thread this 
starts...) filepeek. As an aside, reducing the amount of data in overflow 
reduces the risk of corruption, by minimizing the number of links, which 
failure points.

So you can enable U2 64-bit addressing in the (udt/uv)config file, which 
will then make the limit a historical curiosity. Or you can use dynamic 
files (although at the most - with a lot of luck - this gives you 4Gb), or 

in UniVerse you can use distributed files, which imho are a better choice 
anyway, making the size of a file limited only by your disk drive budget.

"Our greatest duty in this life is to help others. And please, if you 
help them, could you at least not hurt them?" - H.H. the Dalai Lama

"When buying & selling are controlled by legislation, the first thing to 
bought & sold are the legislators" - P.J. O'Rourke

Dan Fitzgerald

>From: Jason Theis <[EMAIL PROTECTED]>
>Reply-To: U2 Users Discussion List <[EMAIL PROTECTED]>
>To: 'U2 Users Discussion List' <[EMAIL PROTECTED]>
>Subject: RE: 2 gig limits
>Date: Tue, 10 Feb 2004 12:40:15 -0700
>We are looking to move to Universe.  Does a 2 gig limit apply to Universe 

>well?  Does it only apply to the backup or live data?
>u2-users mailing list

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