Re: Reserved space

[Justin Piszcz <jpiszcz lucidpixels com>]

On Tue, 28 Aug 2007, Theodore Tso wrote:

> On Tue, Aug 28, 2007 at 08:49:37PM +0200, beevis libero it wrote:
> > Thanks for clarification. So I understand this 5% is reserved in
> > order to prevent fragmentation.
>
> If you want to be pedantic, to allow ext3's anti-fragmentation
> algorithsm to work more efficiently.  It will not (by a long shot!)
> completely remove fragmentation, but rather, fragmentation will
> increase as you use last 5-10% of the filesystem.  We arbitrarily set
> 5% as the reserve; UFS (as used in Solaris, BSD, and many other
> historical Unix systems) set the reserve at 10%.
>
> 	   		     	 	 - Ted
>
>
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Does anyone have any metrics as to how bad it gets for 1% 2% 3% 4% and 5% 
reservations?  The difference between 1% and 5% can be a lot with 1TB 
drives etc.

Justin.