linux-kernel - Re: scsi: Devices offlined

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Date:	Tue, 20 Mar 2007 22:15:56 -0400
From:	Wakko Warner <wakko@...mx.eu.org>
To:	Philippe Troin <phil@...i.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: scsi: Devices offlined

Philippe Troin wrote:
> Wakko Warner <wakko@...mx.eu.org> writes:
> 
> > [84797.683873] sr 1:0:13:0: scsi: Device offlined - not ready after error recovery
> > 
> > Is there anyway to make the kernel "online" a device that has done this? 
> > I've had this happen on various devices (mostly on usb where I can
> > unplug/replug), but this time, it's on a scsi controller and the driver is
> > not a module.
> > 
> > If it's possible to do this w/o rebooting, I'd like to know for when I have
> > this happen in the future.
> 
> Have you tried:
> 
>   echo remove-single-device BUS ID LUN > /proc/scsi
>   echo add-single-device BUS ID LUN > /proc/scsi

I tried:
echo "scsi remove-scingle-device 1 0 13 0" > /proc/scsi/scsi
<device removed from /proc/scsi/scsi list>
echo "scsi add-scingle-device 1 0 13 0" > /proc/scsi/scsi
<device does not show up in /proc/scsi/scsi list>

I also tried your method, which just gives invalid argument (using
/proc/scsi/scsi, since /proc/scsi is a directory)

According to scsi_proc.c:
        /*
         * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
         * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
         */

        /*
         * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
         * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
         */

Either way, nothing.

Er, on second though, I actually unplugged the power from the scsi device
and replugged it and it shows up now.  Oh well..  Thanks anyway =)

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