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

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Date:	Fri, 01 Feb 2013 17:48:07 +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 05:24 PM, Jack Wang wrote:
> 
> 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
sorry, no response either.

Thanks,
Tao
> 
> ?
> Thanks,
> Tao
>>
>> Jack
>>
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