Veritas-bu

Re: [Veritas-bu] NBU 5.1: Disk staging causing heavy fragmentation

2008-02-20 12:06:50
Subject: Re: [Veritas-bu] NBU 5.1: Disk staging causing heavy fragmentation
From: Jon Bousselot <jon-bousselot AT pacbell DOT net>
To: veritas-bu AT mailman.eng.auburn DOT edu
Date: Wed, 20 Feb 2008 08:46:23 -0800
I'm curious if the image fragment size has any impact on file system 
fragmentation?

I have used 2gb for disk staging on vxfs/solaris successfully, but I 
never got the DSU volume much past 80% full.



-Jon


> Today's NTFS handles fragmentation alot better - in fact, FAT and 
> FAT32 were really the main file systems that would always get 
> fragmented. That is not to say NTFS is not immune to the fragmentation 
> that people may experience, but there are ways around to minimise it 
> even more.
>  
> Depending on the volume itself, and its intention is the key to 
> keeping fragmentation down. When you format a volume you get the 
> option of a "cluster" size. But you must be aware of what the volume 
> itself will be storing. (for example, large files, or millions of 
> small files).
>  
> By default, when formatting, Windows keeps a "default" setting in 
> place. Choosing a smaller cluster variable will waste less disk space 
> but likely to cause fragmentation.
>  
> Likewise, a larger cluster variable will cause less fragmentation but 
> waste space. further details can be found in the online help of 
> Win2k3, XP, 2000, ect !
>  
> Not to put my foot in it, but I am sure other systems suffer, but 
> maybe its a NTFS thing ;-)
> Simon.
>  

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