Date: Wed, 29 Mar 2000 11:55:21 +0200 From: Brad Knowles <blk@skynet.be> To: mjacob@feral.com, Carl Makin <carl@xena.IPAustralia.gov.au> Cc: current@FreeBSD.ORG Subject: Re: Dual Pathing to SCSI/FC devices. Message-ID: <v04220800b50782638fa2@[195.238.20.81]> In-Reply-To: <Pine.BSF.4.10.10003281626480.1744-100000@beppo.feral.com> References: <Pine.BSF.4.10.10003281626480.1744-100000@beppo.feral.com>
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At 4:28 PM -0800 2000/3/28, Matthew Jacob wrote: > Yes, we very much has considered this. What's your issue about this, per se? > Right now there's no framework code to directly exploit or prohibit multiple > paths to the same disk, whether via Fibre Channel or SCSI. Myself, I just need to be able to tell the system that SCSI ID x LUN y is actually the same logical device as SCSI ID v LUN w, but that one is preferred and the other is backup, and have FreeBSD deal with doing the re-targeting in the CAM SCSI driver. The end result should be that nothing above the CAM SCSI driver should know that a switch has occurred -- especially not programs like vinum, which might be called upon to do software mirroring/striping/RAID on top of the hardware mirroring/striping/RAID. Same deal with fibrechannel as SCSI. Does that about sum it up? Oh, and Carl -- I don't suppose you're looking at Hitachi DF400 (sometimes rebadged as Comparex D1400) units, are you? If so, I'd like to talk to you in some depth about these things -- maybe you can come up with some solutions for some problems I've had. -- These are my opinions -- not to be taken as official Skynet policy ====================================================================== Brad Knowles, <blk@skynet.be> || Belgacom Skynet SA/NV Systems Architect, Mail/News/FTP/Proxy Admin || Rue Colonel Bourg, 124 Phone/Fax: +32-2-706.13.11/12.49 || B-1140 Brussels http://www.skynet.be || Belgium To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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