Joseph L. Casale wrote:
This is an old way of doing it but it's worked fine for me over the years.
I think the new way is documented here: http://www.linuxjournal.com/article/7321
i've had very good luck with
echo "- - -" > /sys/class/scsi_host/host?/scan
replacing ? with the proper scsi/fiberchannel host channel #
done this on online systems with minimal impact to other in-use drives.