Date: Thu, 9 Jan 1997 19:07:07 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: msmith@atrad.adelaide.edu.au (Michael Smith) Cc: mrcpu@cdsnet.net, hackers@freebsd.org Subject: Re: CCD mirroring... Message-ID: <199701100207.TAA19125@phaeton.artisoft.com> In-Reply-To: <199701100140.MAA29894@genesis.atrad.adelaide.edu.au> from "Michael Smith" at Jan 10, 97 12:10:21 pm
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> 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.
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