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Date: Fri, 11 Apr 2003 16:18:43 -0700
From: Joel Becker <Joel.Becker@oracle.com>
To: Patrick Mansfield <patmans@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>, Giuliano Pochini <pochini@shiny.it>,
       linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
       Mike Anderson <andmike@us.ibm.com>
Subject: Re: [patch for playing] Patch to support 4000 disks and maintain
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References: <200304101339.49895.pbadari@us.ibm.com> <XFMail.20030411100430.pochini@shiny.it> <20030411154450.GW31739@ca-server1.us.oracle.com> <200304110928.32978.pbadari@us.ibm.com> <20030411175736.GY31739@ca-server1.us.oracle.com> <20030411111232.A7756@beaverton.ibm.com> <20030411183543.GA31739@ca-server1.us.oracle.com> <20030411130407.A9302@beaverton.ibm.com>
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On Fri, Apr 11, 2003 at 01:04:07PM -0700, Patrick Mansfield wrote:
> If we had user scanning, and some sort of hotplug for targets coming and
> going, those be used to add and remove (or just fail) paths (at least for
> switch attached).

	That's the issue.  We need notification of add and remove, so we
don't find our multipathing hanging for 90s or more.  That's a big deal
to people, and it's a problem with the current md multipath.

Joel

-- 

 "I'm living so far beyond my income that we may almost be said
 to be living apart."
         - e e cummings

Joel Becker
Senior Member of Technical Staff
Oracle Corporation
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127