# Re: Rescan SCSI Bus

From: Rene Rebe (rene.rebe@myokay.net)
Date: Thu Oct 12 2000 - 09:44:49 PDT

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  Hi!

  Devfs (currently only in the kernel series 2.3.x or as patch) is
  another good idea, too.

  http://www.atnf.csiro.au/~rgooch/linux/kernel-patches.html

  With devfs you have a fine stuctured device tree in /dev.

  ie: /dev/scsi/host0/bus0/target6/lun0/generic
  is my scanner cause it ever has scsi-id 6 ... ;-)

  Douglas Gilbert <dgilbert@interlog.com> wrote:

  > Steffen Vogelreuter wrote:
  > >
  > > My scanner was off during reboot. I wanted my scanner work without another reboot
  > > and I used the echo command from the FAQ but the scanner was detected as sg3
  > > and not as sg2 as he is detected at normal reboot. After that SANE returns "no
  > > devices available" How can I tell the echo to use the scanner as sg2 or SANE to
  > > use sg3.
  >
  > You can't. Once a sg mapping (sd, sr, or st mapping) has been
  > established then 'echo "scsi add-single-device ..." ' will
  > not change that mapping but append the new device.
  >
  > What you may be able to do is remove the device occupying
  > /dev/sg2 (with 'remove-single-device') and then add your
  > scanner followed by the re-adding the device that originally
  > occupied /dev/sg2 . This would not be a good idea if
  > /dev/sg2 was a disk containing your root file system.
  >
  > There are other possibilities as well. See the FAQ (question
  > 4.6) at: http://www.torque.net/sg/faq.html .
  > The 'scsidev' utility might be a useful addition to the
  > SANE release for people who have several SCSI devices
  > which are not always present at boot.
  >
  > Doug Gilbert
  >
  > --
  > Source code, list archive, and docs: http://www.mostang.com/sane/
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  >

  k33p h4ck1n6 René

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