From owner-freebsd-current Mon Dec 10 10:23: 4 2001 Delivered-To: freebsd-current@freebsd.org Received: from freebie.xs4all.nl (freebie.xs4all.nl [213.84.32.253]) by hub.freebsd.org (Postfix) with ESMTP id EBF9537B41B; Mon, 10 Dec 2001 10:22:55 -0800 (PST) Received: (from wkb@localhost) by freebie.xs4all.nl (8.11.6/8.11.6) id fBAIMpj65394; Mon, 10 Dec 2001 19:22:51 +0100 (CET) (envelope-from wkb) Date: Mon, 10 Dec 2001 19:22:51 +0100 From: Wilko Bulte To: Matthew Dillon Cc: Mike Smith , Terry Lambert , Joerg Wunsch , freebsd-current@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern subr_diskmbr.c Message-ID: <20011210192251.A65380@freebie.xs4all.nl> References: <200112101754.fBAHsRV01202@mass.dis.org> <200112101813.fBAIDKo47460@apollo.backplane.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200112101813.fBAIDKo47460@apollo.backplane.com>; from dillon@apollo.backplane.com on Mon, Dec 10, 2001 at 10:13:20AM -0800 X-OS: FreeBSD 4.4-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Mon, Dec 10, 2001 at 10:13:20AM -0800, Matthew Dillon wrote: > :Spindle sync is an anachronism these days; asynchronous behaviour > :(write-behind in particular) is all the rage. You'd be hard-pressed to > :find drives that even support it anymore. > > Woa! Say what? I think you are totally incorrect here Mike. > Spindle sync is not an anachronism. You can't get good RAID{0,2,3,4,5} For RAID3 that is true. For the other ones... > performance without it - for reading OR writing. It doesn't matter > so much for RAID{1,10}, but it matters a whole lot for something like > RAID-5 where the difference between a spindle-synced read or write > and a non-spindle-synched read or write can be upwards of 35%. If you have RAID5 with I/O sizes that result in full-stripe operations. -- | / o / /_ _ email: wilko@FreeBSD.org |/|/ / / /( (_) Bulte Arnhem, The Netherlands To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message