From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt Gulick Subject: Re: Connecting same device through dual HBAs Date: Thu, 01 Apr 2004 10:09:18 -0600 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <1080835758.5300.8.camel@localhost.localdomain> References: Reply-To: gulickconsulting@direcway.com Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7BIT Return-path: Received: from a34-mta01.direcpc.com ([66.82.4.90]:44219 "EHLO a34-mta01.direcway.com") by vger.kernel.org with ESMTP id S262932AbUDAQJ3 (ORCPT ); Thu, 1 Apr 2004 11:09:29 -0500 Received: from [40.0.0.57] (dpc6935101125.direcpc.com [69.35.101.125]) by a34-mta01.direcway.com (iPlanet Messaging Server 5.2 HotFix 1.12 (built Feb 13 2003)) with ESMTP id <0HVI003BT27IST@a34-mta01.direcway.com> for linux-scsi@vger.kernel.org; Thu, 01 Apr 2004 11:09:27 -0500 (EST) In-reply-to: List-Id: linux-scsi@vger.kernel.org To: Christopher Campise Cc: linux-scsi@vger.kernel.org Chris, Some additional info may be needed here. If the 2 SCSI cards are connected to the same array, they may have a SCSI ID conflict. It sounds as if the array that you have attached has two SCSI interfaces. Are you sure that this is not a pass-through for daisy chaining multiple units? If it is, then the 2 cards and the array are all on the same SCSI bus. The end result is a multi initiator situation. Check to see if the SCSI ID of one of the HBA cards can be altered. Another thing to do for testing, is disconnect one of the cards from the array (power everything down first lest you blow the TERM PWR fuse). Check the system again. What SCSI ID do you get for the array and for the card. Power down, re-connect the one card, disconnecting the tested card and do the same test, noting the IDs. Do not connect each card to the same SCSI port on the array. We are also looking to see if the two ports report identical SCSI IDs. If the IDs are identical each time, then there will be a conflict that will need resolving. Good luck. Matt ---------------------------------------- Matt Gulick Sr. Staff Engineer Adaptec, Inc. gulickconsulting@direcway.com matt_gulick@adaptec.com (715) 426-0884 On Thu, 2004-04-01 at 08:56, Christopher Campise wrote: > Hello Everyone- > > First time caller here. :) > > I'm currently running a Redhat9.0 setup with kernel 2.4.20-8. I wish to > connect to a scsi external storage array, that has two interface cards, > via two Host Bus Adapters on my linux box (in an attempt to increase > throughput). > > I'm using the stock qla2300 drivers and can see both cards when I do a > 'cat /proc/scsi/scsi' but I've only been able to see the array (and it's > associated LUNs) through one HBA though. I've done some research and came > across the multipath concept and being not entirely sure of what it is, > was wondering if this is the direction I should continue to pursue in > order to accomplish this? Or, if not, does anyone have advice as to what > I need to do to get this to work (if at all possible)? > > Thanks in advance! > > Chris > > - > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html