scanning for new scsi devices

hodgsonjk · 04-22-2005, 02:45 AM

I have a Red Hat As 3 machine and have installed a qlogic fibre card 2340 which works fine. The modules loads on boot and I can scan the fibre card for scsi devices. The cards sees an 18gb scsi device which I have presented to it via the san. But my questions is how do I get Linux to see the disk without rebooting the machine. If the machine is rebooted it will pick up the disk and I will be able to fdisk it etc, but if I don't want to have to reboot the machine is there anyway I can get linux to see this scsi device?

mritch · 04-22-2005, 02:39 PM

New devices can be added using echo "scsi add-single-device <h> <b> <t> <l>" > /proc/scsi/scsi where the variables are host, bus (channel), target (scsi id) and lun. The success (or otherwise) of this command can be determined by sending a subsequent cat /proc/scsi/scsi command.

..from the scsi-howto (proc interface) at www.tldp.org - see it for more info.

i have a script "rescan-scsi-bus.sh" here on debian which uses the above method to recheck devices.

HTH ritch.

hitchhikerjim · 05-13-2005, 06:01 PM

OK -- I got that script working...

but the further complilcation that I imagine the above user is having too is that I have a fiber device. Something maps the fiber devices to SCSI devices names... and rescan-scsi-bus.sh only maps things that have assigned SCSI IDs.

How do I get something to scan the fiber fabric and map any new devices on it to a new SCSI ID so that rescan-scsi-bus.sh will be able to find the new device?

(i'm on redhat E3 too)

jim