Posted by pete on 8th May 2008
When you need to hot-add a SCSI disk to a Linux server, the following command will get the OS to re-scan the SCSI bus:
echo - - - >/sys/class/scsi_host/host$NUMBER/scan
$NUMBer is usually 0, but if you have more SCSI busses, you need to verify.
For more information on this, check here.