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I found this a few years ago, cannot remember from where(from the IBM Linux site I think), but this should help;
One of the most useful things to learn as a system administrator is how to add more disk space if you have hot-swap drives available to you, without rebooting the system. Without using /proc, you could insert your drive, but you would then have to reboot in order to get the system to recognize the new disk. Here, you can get the system to recognize the new drive with the following command:
echo "scsi add-single-device w x y z" > /proc/scsi/scsi
For this command to work properly, you must get the parameter values w, x, y, and z correct, as follows:
* w is the host adapter ID, where the first adapter is zero (0)
* x is the SCSI channel on the host adaptor, where the first channel is zero (0)
* y is the SCSI ID of the device
* z is the LUN number, where the first LUN is zero (0)
Once your disk has been added to the system, you can mount any previously formatted filesystems or you can start formatting it, and so on. If you are not sure about what device the disk will be, or you want to check any pre-existing partitions, for example, you can use a command such as fdisk -l, which will report this information back to you.
Conversely, the command to remove a device from your system without a reboot would be:
echo "scsi remove-single-device w x y z" > /proc/scsi/scsi
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