How to find info about a LUN

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http://www.linuxquestions.org – From a linux host, how can I find information about a lun that has been exported. For example, if I have 3 100G luns available via FC. How can I tell which is which?? I've looked at fdisk, /proc/scsi/scsi, /sys, lscsi, sg3_utils. So If I want to destroy one of these luns, how can I find out how to identify it on the san device? 2.6 kernel. Not looking for something distro specific, but i have a mix of rhel5 and sles. (HowTos)