N-way mirror read speedup in zfsonlinux

[Alexander Motin]

On 16.08.2013 00:41, Steven Hartland wrote:
> ----- Original Message ----- From: "Alexander Motin" <mav at FreeBSD.org>
>
>> On 15.08.2013 23:00, Steven Hartland wrote:
>>> ----- Original Message ----- From: "Alexander Motin" <mav at FreeBSD.org>
>>>> 4) I don't very like idea of expanding struct disk every time
>>>> (especially not at the end). While that is probably easier then
>>>> alternatives, now we have d_getattr method specifically to avoid that.
>>>
>>> I see what you mean but it needs to be stored somewhere otherwise
>>> we're going to have to query the device every time or did you have
>>> something else specific in mind?
>>
>> I was thinking about storing it in da/ada periph softc's and modifying
>> dagetattr()/adagetattr().
>
> That would make it more work to add non-cam based support such as mfi.

That is why I have told that indeed proposed implementation is easier 
then alternatives. :) BTW, does RAID controllers like mfi can provide 
such details?

-- 
Alexander Motin