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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 01 Feb 2013 08:54:06 +0100
From:	Bart Van Assche <bvanassche@....org>
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 02/01/13 07:13, Tao Ma wrote:
> 	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?

Please note that I'm not familiar with SAS. But I found this in 
drivers/scsi/scsi_proc.c:

  * proc_scsi_write - handle writes to /proc/scsi/scsi
  * @file: not used
  * @buf: buffer to write
  * @length: length of buf, at most PAGE_SIZE
  * @ppos: not used
  *
  * Description: this provides a legacy mechanism to add or remove
  * devices by Host, Channel, ID, and Lun.  To use,
  * "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or
  * "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with
  * "0 1 2 3" replaced by the Host, Channel, Id, and Lun.

Bart.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/