Re: hdaprm -Y /dev/sda /dev/sdb -> I/O error -> disk kicked out of RAID - is it normal?

[Tejun Heo <tj@kernel.org>]

Jeff Garzik wrote:
> Tejun Heo wrote:
>> NeilBrown wrote:
>>> I tried that and easily found cases where it fails way too fast.
>>> FAILFAST seems to mean different things on different devices, making
>>> it useless in general (it is still useful in some specific cases
>>> such as multipath on devices which are expected to be used under
>>> multipath and so treat FAILFAST appropriately).
>>
>> Yeap, FAILFAST flags seem geared pretty much toward multipathing.
> 
> Yes :/
> 
> I'm glad this area is getting some attention, because we ideally want to
> do two things in parallel:
> 
> * send upper layer advisory message, when we first notice a failure
> * begin EH recovery
> 
> Time passes, libata attempts recovery, and completes the command with
> success or failure many seconds later.
> 
> Right now, failfast handling is inconsistent, and is not (I think...)
> always signalled as soon as we begin EH.

Heh.. yeah, it's notified on completion of EH, which BTW is pretty
dumb.  :-)

-- 
tejun