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Date:      Mon, 5 Feb 1996 14:17:36 -0700 (MST)
From:      Terry Lambert <terry@lambert.org>
To:        jon@technix.org (Basket Case)
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Decreasing the percentage (10%) of a filesystem owned by root
Message-ID:  <199602052117.OAA16928@phaeton.artisoft.com>
In-Reply-To: <199602051805.NAA17668@technix.org> from "Basket Case" at Feb 5, 96 01:05:34 pm

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> I notice that 10% of a HD is generally allocated for root to make sure root
> has some extra room for files and stuff.  How can i decrease this percentage
> as 10% on a 9gb drive takes a big toll and I'd like to reduce that.  Would
> I also have to reformat?


man tunefs.

Look at the option "-m".

The default is 8%.


The reserve typically cause what is (effectively) a hash-to-disk in the
block allocation algorithm to operate at optimal efficiency.  The side
effect that allows root to ignore this is an issue of administrative
fiat, not an issue of "holding reserve for root".

See Knuth, "Sorting and Searching" on hash efficiency.


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.



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