Re: [PATCH] scsi: Allow error handling timeout to be specified

Martin K. Petersen
2013-05-14T22:21:40Z

>>>>> "Jeremy" == Jeremy Linton <jlinton@tributary.com> writes:

>> others. We see cases fairly often where a misbehaving target has
>> confused the HBA enough that we can not bring the device back without
>> doing an HBA firmware reset. Despite I/O completing successfully on
>> other targets connected to the same HBA.

Jeremy> This would seem to indicate a HBA/driver bug...

Yep. It's not just targets that go bad!

Jeremy> Except that I've seen the linux error recovery cause more
Jeremy> problems than it solves on a fairly regular basis. I would
Jeremy> rather have a solution designed to isolate failures, than one
Jeremy> that makes a lot of mistakes and causes further problems
Jeremy> (sometimes with other machines). I'm pretty convinced that
Jeremy> attempting everything possible to recover a device when the
Jeremy> underlying problem is unknown is a bad strategy.

There is no one size that fits all. Which is why we're taking steps to
make the error recovery parameters tweakable.

--
Martin K. Petersen Oracle Linux Engineering