From owner-freebsd-hackers Thu Jan 9 18:18:46 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id SAA07078 for hackers-outgoing; Thu, 9 Jan 1997 18:18:46 -0800 (PST) Received: from phaeton.artisoft.com (phaeton.Artisoft.COM [198.17.250.211]) by freefall.freebsd.org (8.8.4/8.8.4) with SMTP id SAA07067 for ; Thu, 9 Jan 1997 18:18:42 -0800 (PST) Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id TAA19125; Thu, 9 Jan 1997 19:07:07 -0700 From: Terry Lambert Message-Id: <199701100207.TAA19125@phaeton.artisoft.com> Subject: Re: CCD mirroring... To: msmith@atrad.adelaide.edu.au (Michael Smith) Date: Thu, 9 Jan 1997 19:07:07 -0700 (MST) Cc: mrcpu@cdsnet.net, hackers@freebsd.org In-Reply-To: <199701100140.MAA29894@genesis.atrad.adelaide.edu.au> from "Michael Smith" at Jan 10, 97 12:10:21 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-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > Jaye Mathisen stands accused of saying: > > > > Does CCD when using the mirroring option satisfy the read from the disk > > that's closest to the data? or does it just always read from the first > > disk, with the second disk being a backup? > > There's no useful way to work out "where" a disk is at, so it's not > possible to operate in the first mode you describe. > > > The latter seems to be the case, but I'm not positive. > > It is. Contact Rod Grimes; I believe he was playing with "spindle sync", which would let you "know". At the very least, it should interleave requests between disks (I know, not much of a win for the TCQ-enabled among us). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.