hot swap scsi drive

[luke]

i have a pe2450 with 4 sca bays. i've tried to find information on
hotswapping hard drives on google, but to no avail. is there something
i need to do before i unplug a drive? obviously, i will not have any
slices from it mounted when i unplug it. also, if i add a drive, do i
need to rescan the scsi bus somehow? under normal circumstances i
would just try to pull one and put another in, but i don't want to
damage a drive or corrupt the data thereon. thanks

luke