scsi_eh updates

Hi all,

(before leaving for holiday ...)

I'd like to attend LSF 2014.

During that I'd like to discuss the current status of the SCSI EH and the future planned updates.

As discussed during last year's LSF the SCSI error handler should be updated to handle modern SCSI transports better.
While some patchsets are already merged, there are some issues which are still open:
- Handling of requests during host reset:
Do we need to keep hold of outstanding requests during host reset? Or is it save to return them prior to host reset?
- Check for transport status prior to sending TMFs.
Task management functions typically need a working I_T nexus, so it does make sense to first check the transport status prior to attempting any TMFs
- Further steps for updating SCSI EH
As these are tricky issues which have possible repercussions on the entire subsystem and LLDDs it'd be good to have a broader discussion here.

I'd like to attend LSF 2014.

During that I'd like to discuss the current status of the SCSI EH and the future planned updates.

As discussed during last year's LSF the SCSI error handler should be updated to handle modern SCSI transports better.
While some patchsets are already merged, there are some issues which are still open:
- Handling of requests during host reset:
Do we need to keep hold of outstanding requests during host reset? Or is it save to return them prior to host reset?
- Check for transport status prior to sending TMFs.
Task management functions typically need a working I_T nexus, so it does make sense to first check the transport status prior to attempting any TMFs
- Further steps for updating SCSI EH
As these are tricky issues which have possible repercussions on the entire subsystem and LLDDs it'd be good to have a broader discussion here.

Hi all,

(before leaving for holiday ...)

I'd like to attend LSF 2014.

During that I'd like to discuss the current status of the SCSI EH and the future planned updates.

As discussed during last year's LSF the SCSI error handler should be updated to handle modern SCSI transports better.
While some patchsets are already merged, there are some issues which are still open:
- Handling of requests during host reset:
Do we need to keep hold of outstanding requests during host reset? Or is it save to return them prior to host reset?
- Check for transport status prior to sending TMFs.
Task management functions typically need a working I_T nexus, so it does make sense to first check the transport status prior to attempting any TMFs
- Further steps for updating SCSI EH
As these are tricky issues which have possible repercussions on the entire subsystem and LLDDs it'd be good to have a broader discussion here.

Happy X-mas,

Hannes

Signature · 8 lines

Dr. Hannes Reinecke		      zSeries & Storage
[email protected]			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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Quoted 9 lines · Hannes Reinecke

Hi all,

(before leaving for holiday ...)

I'd like to attend LSF 2014.

During that I'd like to discuss the current status of the SCSI EH and the future planned updates.

Quoted 15 lines

As discussed during last year's LSF the SCSI error handler should be updated to handle modern SCSI transports better.
While some patchsets are already merged, there are some issues which are still open:
- Handling of requests during host reset:
Do we need to keep hold of outstanding requests during host reset? Or is it save to return them prior to host reset?
- Check for transport status prior to sending TMFs.
Task management functions typically need a working I_T nexus, so it does make sense to first check the transport status prior to attempting any TMFs
- Further steps for updating SCSI EH
As these are tricky issues which have possible repercussions on the entire subsystem and LLDDs it'd be good to have a broader discussion here.

+1

I would like to participate in this discussion to provide inputs from LLDDs.

On 12/20/13 6:54 AM, "Hannes Reinecke" <[email protected]> wrote:

Quoted 16 lines

As discussed during last year's LSF the SCSI error handler should be updated to handle modern SCSI transports better.
While some patchsets are already merged, there are some issues which are still open:
- Handling of requests during host reset:
Do we need to keep hold of outstanding requests during host reset? Or is it save to return them prior to host reset?
- Check for transport status prior to sending TMFs.
Task management functions typically need a working I_T nexus, so it does make sense to first check the transport status prior to attempting any TMFs
- Further steps for updating SCSI EH
As these are tricky issues which have possible repercussions on the entire subsystem and LLDDs it'd be good to have a broader discussion here.

+1

I would like to participate in this discussion to provide inputs from LLDDs.