I'm not doing something brand new here. It's a FC tool set I've been using for many years, very useful, just updated to reflect RHEL6 latest kernel.
Tested on kernel2.6.32-358.14, using Emulex and Qlogic cards. Should be good for other types of HBA too, just add vendor info to ls_fc_luns

You can still download its origional version from the link below, but won't work for your RHEL6
http://dims.ncsa.illinois.edu/set/san/src/sysfs_fc_tools.tgz

Scripts to simplify attaching, displaying, deleting fibre channel luns using 2.6 kernel sysfs features.

It includs 4 scripts:

lip_fc_hosts
ls_fc_luns
scan_fc_luns
delete_fc_luns

Here are useage examples:
lip_fc_hosts
    Send lip to all local FC HBAs.

scan_fc_luns
    Scan all local FC HBAs for new luns and present them to the kernel.

ls_fc_luns
    List HBA WWPN, target WWPN, kernel device name, scsi H:B:T:L tuple and scsi_id for all fibre channel luns.

delete_fc_luns
    Delete (detach) all fibre channel luns from the system.

Requires Linux 2.6 Kernel and sysfs pseudo-filesystem.

How to get Vendor code? here you go. Once yoou have the vendor code for different type of HBA card, then add it to ls_fc_lun function get_hba_wwpn or drop me an e-mail.

For how to get HBA pci info, see the link below

https://sites.google.com/site/itmyshare/storage/how-to-install-check-upgrade-and-remove-hba-card-in-linux-rhel6

More technical details:

echo "1" > /sys/class/fc_host/host/issue_lip

    This operation performs a Loop Initialization Protocol (LIP) and then scans the interconnect and causes the SCSI layer to be updated to reflect the devices currently on the bus. A LIP is, essentially, a bus reset, and will cause device addition and removal. This procedure is necessary to configure a new SCSI target on a Fibre Channel interconnect.

    Bear in mind that issue_lip is an asynchronous operation. The command may complete before the entire scan has completed. You must monitor /var/log/messages to determine when it is done.

    Currently only the lpfc and qla2xxx drivers support issue_lip.

echo "- - -" > /sys/class/scsi_host/hosth/scan


     In this case, however, the channel number, SCSI target ID, and LUN values are replaced by wildcards. Any combination of identifiers and wildcards is allowed, allowing you to make the command as specific or broad as needed. This procedure will add LUNs, but not remove them.

echo 1 > /sys/class/scsi_device/h:c:t:l/device/delete


You can determine the device-name, HBA number, HBA channel, SCSI target ID and LUN for a device from various commands, such as lsscsi, scsi_id, multipath -l, and ls -l /dev/disk/by-*.