Dynamically insert and remove SCSI devices

["John S. Kallal" <kallal@voicenet.com>]

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	At the February meeting someone asked about how to add SCSI
devices after SCSI controller initialization.  This was needed for
devices that where powered on after the SCSI controller driver 
was started and SCSI file-systems mounted.  I volunteered to look 
into the problem.
	I found a possible solution to the problem in a section 
of the 'The Linux SCSI programming HOWTO' v1.5 dated 7 May 1996.
The HOWTO section of interest is 4.3.1  entitled 'Dynamically 
insert and remove SCSI devices'.
	The HOWTO section give the following:

- -----------------------------------------------------------------
  To remove a SCSI device:

       echo "SCSI remove-single-device a b c d" > /proc/scsi/scsi

  and similar, to add a SCSI device, do

       echo "scsi add-single-device a b c d" > /proc/scsi/scsi

  where

             a == host-adapter id (first one being 0)
             b == SCSI channel on host-adapter (first one being 0)
             c == ID
             d == LUN (first one being 0)
- ------------------------------------------------------------------

	I have tried to above with on my Linux system using both 
kernel 2.0.34 and kernel 2.2.2 with detecting any problems.  
However, my limited SCSI chain has just a SCANNER and an external
CD-READER/WRITER.   I do can NOT test the above method with a 
mounted root SCSI file system. 
	Sorry about taking so long to find a possible solution.


John Kallal


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