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

[Bart Van Assche]

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.
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