On 2.6 kernels, I always used to issue the commands directly:
1) Find what's the host number for the HBA:
ls /sys/class/fc_host/
(You'll have something like host1 or host2, I'll refer to them as host$NUMBER from now on)
2) Ask the HBA to issue a LIP signal to rescan the FC bus:
echo 1 >/sys/class/fc_host/host$NUMBER/issue_lip
3) Wait around 15 seconds for the LIP command to have effect
4) Ask Linux to rescan the SCSI devices on that HBA:
echo - - - >/sys/class/scsi_host/host$NUMBER/scan
The wildcards "- - -" mean to look at every channel, every target, every lun.
That's it. You can look for log messages at "dmesg" to see if it's working, and you can look at /proc/scsi/scsi to see if the devices are there.
These commands should work with all HBAs, at least I know for sure they work with QLogic's and Emulex'es.
Hope it helps,
Filipe
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