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<TITLE>sane-devel: Re: Rescan SCSI Bus</TITLE>
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<H1>Re: Rescan SCSI Bus</H1>
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<STRONG>From:</STRONG> Douglas Gilbert (<A HREF="mailto:dgilbert@interlog.com?Subject=Re:%20Rescan%20SCSI%20Bus&In-Reply-To=&lt;39E5E061.76AA235A@interlog.com&gt;"><EM>dgilbert@interlog.com</EM></A>)<BR>
<STRONG>Date:</STRONG> Thu Oct 12 2000 - 09:01:37 PDT
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Steffen Vogelreuter wrote:
<BR>
<EM>&gt;
</EM><BR>
<EM>&gt; My scanner was off during reboot. I wanted my scanner work without another reboot
</EM><BR>
<EM>&gt; and I used the echo command from the FAQ but the scanner was detected as sg3
</EM><BR>
<EM>&gt; and not as sg2 as he is detected at normal reboot. After that SANE returns &quot;no
</EM><BR>
<EM>&gt; devices available&quot; How can I tell the echo to use the scanner as sg2 or SANE to
</EM><BR>
<EM>&gt; use sg3.
</EM><BR>
<P>You can't. Once a sg mapping (sd, sr, or st mapping) has been
<BR>
established then 'echo &quot;scsi add-single-device ...&quot; ' will
<BR>
not change that mapping but append the new device.
<BR>
<P>What you may be able to do is remove the device occupying
<BR>
/dev/sg2 (with 'remove-single-device') and then add your
<BR>
scanner followed by the re-adding the device that originally
<BR>
occupied /dev/sg2 . This would not be a good idea if
<BR>
/dev/sg2 was a disk containing your root file system.
<BR>
<P>There are other possibilities as well. See the FAQ (question
<BR>
4.6) at: <A HREF="http://www.torque.net/sg/faq.html">http://www.torque.net/sg/faq.html</A> .
<BR>
The 'scsidev' utility might be a useful addition to the
<BR>
SANE release for people who have several SCSI devices
<BR>
which are not always present at boot.
<BR>
<P>Doug Gilbert
<BR>
<P><PRE>
--
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