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67 wiersze
3.2 KiB
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<!-- received="Wed Dec 10 06:50:10 1997 PST" -->
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<!-- sent="Wed, 10 Dec 1997 09:49:55 -0500" -->
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<!-- name="Matto Marjanovic" -->
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<!-- email="maddog@mir.com" -->
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<!-- subject="Re: Two SCSI bus question..." -->
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<!-- id="199712101449.JAA12983@yoo-hoo.ai.mit.edu" -->
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<!-- inreplyto="Two SCSI bus question..." -->
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<title>sane-devel: Re: Two SCSI bus question...</title>
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<h1>Re: Two SCSI bus question...</h1>
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<b>Matto Marjanovic</b> (<a href="mailto:maddog@mir.com"><i>maddog@mir.com</i></a>)<br>
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<i>Wed, 10 Dec 1997 09:49:55 -0500</i>
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<p>
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<ul>
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<li> <b>Next message:</b> <a href="0061.html">borm: "scanmaker III documentation"</a>
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<li> <b>Previous message:</b> <a href="0059.html">Christoph Doerbeck: "Re: Two SCSI bus question..."</a>
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<li> <b>Maybe in reply to:</b> <a href="0049.html">Christoph Doerbeck: "Two SCSI bus question..."</a>
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<li> <b>Next in thread:</b> <a href="0061.html">borm: "scanmaker III documentation"</a>
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<li> <b>Reply:</b> <a href="0061.html">borm: "scanmaker III documentation"</a>
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<li> <b>Reply:</b> <a href="0063.html">Rogier Wolff: "Re: Two SCSI bus question..."</a>
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</ul>
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<!-- body="start" -->
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<i> > > All detected devices are assigned a raw-device in the order in which they </i><br>
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<i> > > are detected. Scanning the busses goes dev-id first, then bus-id.</i><br>
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<i> > > </i><br>
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<i> > > Thus you first get all devices on the first bus, then all on the second,</i><br>
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<i> > > each in order of the SCSI IDs.</i><br>
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<i> > > </i><br>
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<i> > > Thus your scanner wanders whenever a device that is below it in that ordering</i><br>
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<i> > > scheme is there or not.</i><br>
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<i> > > </i><br>
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<p>
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Alright, out of curiousity then:<br>
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<p>
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Is there any particular reason why SCSI devices are assigned this way, rather<br>
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than having the X in /dev/sgX be a direct function of device id and bus id?<br>
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(e.g. /dev/sgA4 = device with ID=4 on the first bus)<br>
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<p>
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The way it is now, suppose one of 5 scsi disks blows out when you power up,<br>
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then the rest all get their device assignments shifted and your server is<br>
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*totally* screwed...<br>
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<p>
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-matt m.<br>
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<p>
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<p>
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<pre>
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--
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Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
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</pre>
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0061.html">borm: "scanmaker III documentation"</a>
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<li> <b>Previous message:</b> <a href="0059.html">Christoph Doerbeck: "Re: Two SCSI bus question..."</a>
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<li> <b>Maybe in reply to:</b> <a href="0049.html">Christoph Doerbeck: "Two SCSI bus question..."</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0061.html">borm: "scanmaker III documentation"</a>
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<li> <b>Reply:</b> <a href="0061.html">borm: "scanmaker III documentation"</a>
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<li> <b>Reply:</b> <a href="0063.html">Rogier Wolff: "Re: Two SCSI bus question..."</a>
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<!-- reply="end" -->
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</ul>
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