HBA switching devices online status...

HBA switching devices online status...

[Heinz, Michael]

If the SCSI midlayer flags a device as offline due to errors, is there
any way to restore the device once the errors have been resolved?

I'm interested in either manual or automatic (i.e., in the driver)
solutions. Looking through the source for different HBAs I didn't see
any obvious hints.

--
Now, where is that clue? I know I had one a minute ago....
--
mheinz@infiniconsys.com

Re: HBA switching devices online status...

[Douglas Gilbert]

"Heinz, Michael" wrote:
> 
> If the SCSI midlayer flags a device as offline due to errors, is there
> any way to restore the device once the errors have been resolved?
> 
> I'm interested in either manual or automatic (i.e., in the driver)
> solutions. Looking through the source for different HBAs I didn't see
> any obvious hints.

Michael,
It has been suggested that the following sequence will work:

  echo "scsi remove-single-device <h> <b> <t> <l>" > /proc/scsi/scsi
  echo "scsi add-single-device <h> <b> <t> <l>" > /proc/scsi/scsi

where the host, bus, target, lun (parameters above respectively)
are obtained from "cat /proc/scsi/scsi". BTW you can see the state
of the online flag with "cat /proc/scsi/sg/devices" (last column).

My scsimon driver has an ioctl to turn it back on.

There is nothing stopping your HBA driver from setting the
online flag in the Scsi_device structure.

Doug Gilbert

Re: HBA switching devices online status...

[Michael Heinz]

Douglas Gilbert wrote:

>
>There is nothing stopping your HBA driver from setting the
>online flag in the Scsi_device structure.
>
>Doug Gilbert
>
Doug,

Thanks - my main concern was that non of the drivers in drivers/scsi 
actually do that - I was worried that that meant setting the flag was a 
Bad Thing. :-P

-- 
knock knock.

Michael Heinz <mheinz@infiniconsys.com>