linux-kernel - Re: How to online remove an error scsi disk from the system?

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Date:	Fri, 01 Feb 2013 17:17:42 +0800
From:	Tao Ma <tm@....ma>
To:	Jack Wang <jack_wang@...sh.com>
CC:	linux-scsi@...r.kernel.org, 'LKML' <linux-kernel@...r.kernel.org>
Subject: Re: How to online remove an error scsi disk from the system?

On 02/01/2013 04:50 PM, Jack Wang wrote:
> Hi All,
> 	In our product system, we have several sata disks attached to one
> machine. So when one of the disk fails, the jbd2(yes, we use ext4) will hang
> forever and we will get something in /var/log/messages like below.
> It seems to me that the io sent to the scsi layer is never returned back
> with -EIO which is a little bit surprised for me(It should be a timeout
> somewhere, right?). We have tried echo "offline" >
> /sys/block/sdl/device/state, but it doesn't work. So is there any way for us
> to let the scsi device returns all the io requests back with EIO so that all
> the end_io can be called accordingly? Am I missing something here?
> 
> Thanks,
> Tao
> [Jack Wang] 
> Hi Tao,
> 
> Have you tried:
>  echo 1 > /sys/block/sdv/device/delete
It will do some IO first so it will hang doing IO.
>  echo "- - -" > /sys/class/scsi_host/host
What do you mean for this line?
> 
> another way is :
> find out which phy the disk attached to and:
> echo 1 > /sys/class/sas_phy/phy-x:x:x/link_reset
sorry, I have done it, but there is no response.

Thanks,
Tao
> 
> Jack
> 
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