I had to unplug my SCSI cable from the onboard port in one of my 760's... I powered off the tape drive at the opposite end of the cable before unplugging and replugging the cable. Made sure twice I didn't bend pins etc.
Disable the adapter while you did that?
Unfortunately, the attached drive seems no longer to work, trying to access it gives me syslog entries like:
netapp1: scsi.cmd.pastTimeToLive:error]: Device 0b.4: request failed after retry #0: cdb 0x00.
In anyone's experience, is this likely a hung port, that a reboot is likely to clear? Or does this sound more like a hardware issue (bullet hole in foot)?
I think before anything else I would try to disable and then enable the adapter (assuming only the tape drive is on it). I'd go ahead and power cycle the drive while the bus was disabled.
That should cause it to rescan the bus.