[4890] in linux-scsi channel archive
Re: dual-attached disk
daemon@ATHENA.MIT.EDU (thoth@integratus.com)
Wed Oct 14 23:40:53 1998
From: thoth@integratus.com
To: linux-scsi@vger.rutgers.edu
In-reply-to: Your message of "Wed, 14 Oct 1998 13:22:00 +0200."
<Pine.A32.3.95.981014131151.41272B-100000@werner.exp-math.uni-essen.de>
Date: Wed, 14 Oct 1998 10:39:56 -0400
"Dr. Michael Weller" <eowmob@exp-math.uni-essen.de> ,in message <Pine.A32.3.95.
981014131151.41272B-100000@werner.exp-math.uni-essen.de>, wrote:
> P.S. Well, you seem to try to setup some failsafe system. You are aware
> then, that a disk used by two systems over a single bus is single point of
> failure and that the disk is much more likely to fail than a system (well,
> the system might crash, but then it may easily hang the SCSI bus to that
> disk two. (of course, you can have two disk on two scsi busses and two
> adapters's on each system), but a system crashed in some i/o operation
> can easily lock both SCSI busses.
Companies like Nielsen and Home Shopping Network have racks full of
trays full of dual-attached disks which are then mirrored (sometimes triply) and
striped using Veritas. Typically they use fiber-channel instead of SCSI, but I
don't think Linux even supports fiber-channel yet :)
Do not be surprised if some big PC manufacturer starts cranking out similar
systems using Intel hardware and SCSI.
--
Bob Forsman thoth@gainesville.fl.us
http://www.gainesville.fl.us/~thoth/
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