From owner-freebsd-questions Mon Feb 5 13:22:12 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id NAA25604 for questions-outgoing; Mon, 5 Feb 1996 13:22:12 -0800 (PST) Received: from phaeton.artisoft.com (phaeton.Artisoft.COM [198.17.250.211]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id NAA25598 for ; Mon, 5 Feb 1996 13:22:08 -0800 (PST) Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id OAA16928; Mon, 5 Feb 1996 14:17:36 -0700 From: Terry Lambert Message-Id: <199602052117.OAA16928@phaeton.artisoft.com> Subject: Re: Decreasing the percentage (10%) of a filesystem owned by root To: jon@technix.org (Basket Case) Date: Mon, 5 Feb 1996 14:17:36 -0700 (MST) Cc: freebsd-questions@freebsd.org In-Reply-To: <199602051805.NAA17668@technix.org> from "Basket Case" at Feb 5, 96 01:05:34 pm X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@freebsd.org Precedence: bulk > 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.