Date: Thu, 21 Sep 2006 07:58:36 -0500 From: "M. L. Dodson" <mldodson@houston.rr.com> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: freebsd-firewire@freebsd.org Subject: Re: devfs and hot unplugging firewire device Message-ID: <200609210758.36433.mldodson@houston.rr.com> In-Reply-To: <20060921040355.GM23915@funkthat.com> References: <200609191005.17015.mldodson@houston.rr.com> <4511FF85.1000102@centtech.com> <20060921040355.GM23915@funkthat.com>
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On Wednesday 20 September 2006 23:03, John-Mark Gurney wrote: > Eric Anderson wrote this message on Wed, Sep 20, 2006 at 21:57 -0500: > > On 09/20/06 15:16, M. L. Dodson wrote: > > >On Wednesday 20 September 2006 14:42, John-Mark Gurney wrote: > > >>M. L. Dodson wrote this message on Wed, Sep 20, 2006 at 14:14 -0500: > > >>>More experimental results on firewire disks and hot unplugging: > > >>> > > >>>Transcripts of two sessions can be retrieved from > > >>>http://siegfried.utmb.edu/bdodson/firewire.on.histidine.txt and > > >>>http://siegfried.utmb.edu/bdodson/firewire.on.serine.txt > > >> > > >>doh, I think I know what your problem is... you need to do three > > >>or so fwcontrol -r's before the device will disappear... This is > > >>necessary, since each plug causes a rescan, and you don't want > > >> devices disappearing when you add your cd drive... It looks like > > >> adding a timeout would be a good thing to the device orphan... If > > >> the device has been orphaned for more than a minute, drop it, or > > >> three or so resets... > > > > > >That worked. Thanks again! > > > > It's too bad firewire doesn't act more like USB storage in this case - > > you can yank and plug in the same or similar storage using the same > > adapter many many times without issue - I've done this many times. > And that is the behaviour I expected. I did not appreciate the differences between a chain and a tree. I'm a scientist, but not a computer scientist. I have been somewhat verbose in these emails to document my experiences for the archives. Thanks to you all. > USB is a tree w/ hubs... If you have a chain of devices, and need to > pull one in the middle, you'd loose the end devices if firewire > behaved this way... > > /me notes that each have their advantages and disadvantages. -- M. L. Dodson Email: mldodson-at-houston-dot-rr-dot-com Phone: eight_three_two-56_three-386_one
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