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

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Message-ID: <008b01ce005d$ff8c8200$fea58600$@com>
Date:	Fri, 1 Feb 2013 17:24:51 +0800
From:	"Jack Wang" <jack_wang@...sh.com>
To:	"'Tao Ma'" <tm@....ma>
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?

[Jack Wang] Sorry I mean to let the driver rescan to get the disk back.
The line should be :
 echo "- - -" > /sys/class/scsi_host/hostx/scan.

Per above delete does not work , so no need to run this.
> 
> 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.

[Jack Wang] 
What about
echo 1 > /sys/class/sas_phy/phy-x:x:x/hard_reset

?
Thanks,
Tao
> 
> Jack
> 
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