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Date: Thu, 19 Jun 2008 14:49:55 -0600
From: Matthew Wilcox <matthew@wil.cx>
To: Stefan Richter <stefanr@s5r6.in-berlin.de>,
       Pekka J Enberg <penberg@cs.helsinki.fi>,
       Alan Stern <stern@rowland.harvard.edu>, linux-kernel@vger.kernel.org,
       dsd@gentoo.org, linux-usb@vger.kernel.org, vegardno@ifi.uio.no,
       James.Bottomley@HansenPartnership.com, linux-scsi@vger.kernel.org,
       Greg KH <greg@kroah.com>
Subject: Re: [RFC/PATCH] usb-storage: wait for device scanning before mounting root
Message-ID: <20080619204954.GQ4392@parisc-linux.org>
References: <Pine.LNX.4.44L0.0804241704220.14840-100000@iolanthe.rowland.org> <Pine.LNX.4.64.0804250022160.1209@sbz-30.cs.Helsinki.FI> <48118DDD.8010507@s5r6.in-berlin.de> <Pine.LNX.4.64.0804251110400.758@sbz-30.cs.Helsinki.FI> <20080425091122.GA14990@parisc-linux.org> <20080619182310.GA30833@parisc-linux.org> <485AA7EA.6080105@s5r6.in-berlin.de> <20080619185419.GN4392@parisc-linux.org> <20080619195240.GX19934@one-eyed-alien.net>
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On Thu, Jun 19, 2008 at 12:52:40PM -0700, Matthew Dharm wrote:
> First, there are usb-storage devices which are USB<->SCSI bridges and
> therefore support multiple target devices.

This is true.

> Second, you would still need multiple hosts when you have more than 15
> target USB devices, anyway.

This isn't true.  Look at topologies like fibre channel which can have
thousands of targets on a single host.

I would suggest that you want one 'channel' per usb endpoint.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."