Re: [PATCH 0/5] scsi: Allow fast io fail without waiting through timeout

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Hi, James,

On 05/20/2013 11:53 PM, James Smart wrote:
Based on the discussion recently held at LSF 2013, we are
reworking the error recovery path to address all the issues
you are mentioning. That work contradicts these patches.
So for now, these should be held off.

Interesting. Can I have your general goal/idea briefly even
though via a reference? Will the URL below be one you will
refer to?
  http://lwn.net/Articles/548500

And, could I know your current progress/schedule? Especially
when can we see your patches?

Much appreciated!

Thanks,
Ren


On 5/20/2013 3:14 AM, Ren Mingxin wrote:
When there is a scsi command timed-out or failed, the scsi eh
tries a thorugh recovery, which is necessary for non-redundant
systems. However, the thorugh recovery usually takes much time,
which is not acceptable for misson critical systems. To improve
this latency, if we are working on a redundant system, we should
avoid the scsi eh for its long time failing recovery, and quick
failover to another path.

This set of patches is trying to implement above.

NOTE: the userland tools need to eusure the environment
restriction, which will be implemented later.

Thanks,
Ren

Ren Mingxin (5):
   scsi: rename return code FAST_IO_FAIL to FAST_IO
FC transport: Add interface to specify fast io level for timed-out cmds SAS transport: Add interface to specify fast io level for timed-out cmds
   lpfc: Allow fast timed-out io recovery
   mptfusion: Allow fast timed-out io recovery

  drivers/message/fusion/mptscsih.c   |   29 ++++++++-
  drivers/scsi/lpfc/lpfc_scsi.c       |   34 ++++++++++
  drivers/scsi/scsi_error.c           |   18 ++---
  drivers/scsi/scsi_sas_internal.h    |    4 -
drivers/scsi/scsi_transport_fc.c | 112 ++++++++++++++++++++++++++++++++++--
  drivers/scsi/scsi_transport_iscsi.c |    6 -
drivers/scsi/scsi_transport_sas.c | 103 ++++++++++++++++++++++++++++++++-
  include/scsi/scsi.h                 |    2
  include/scsi/scsi_transport_fc.h    |   11 +++
  include/scsi/scsi_transport_sas.h   |    8 ++
  10 files changed, 303 insertions(+), 24 deletions(-)
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