topic Re: dynamic scsi scan in Operating System - Linux

dynamic scsi scan

Maxim Rudnev — Wed, 21 Apr 2004 10:27:42 GMT

How I can rescan scsi bus without restart driver?
I have redhat 8.0, emulex 952 and msa1000.
When I added LUN for this host this LUN doesn't recognized until restart lpfcdd

Re: dynamic scsi scan

Fred Ruffet — Wed, 21 Apr 2004 10:39:26 GMT

It must be discussed in the driver's doc, but what about a kill -1 of the driver ?

Re: dynamic scsi scan

Dineshkumar Surpur — Thu, 22 Apr 2004 00:23:32 GMT

The emulex driver is not capable of scanning
on the driver layer when you add a device.
You need to do unload or reload of lpfcdd
driver

# modprobe -r lpfcdd (unload of driver)
# modprobe lpfcdd (reload of driver)

or would use insmod command
or reboot

Recently qlogic driver 6.06.10 has come up
with statements for scanning driver on qlogic layer and then the scsi layer

Qlogic scan

# echo "scsi-qlascan" > /proc/scsi/qla2300/

scsi scan

# echo "scsi add-single-device id id id id" > /proc/scsi/scsi

where id id id id represents instance bus channel lun

and we will new device dynamically and still serving I/O on the existing devices.

Emulex Driver should be enhanced to support
something like qlogic is already doing.
and the scan statement of scsi will also be
depleted in the future linux releases and i don't know to what it will be changed to.

Re: dynamic scsi scan

Maxim Rudnev — Thu, 22 Apr 2004 02:02:34 GMT

I tryed # echo "scsi add-single-device host bus tid lun" > /proc/scsi/scsi, but there isn't any new LUN.
I tryed scsi_scan script from fiberutils too.

Linux doesn't recognize new LUNs until unload/load driver (lpfcdd.o)