Re: [patch 2/3 v4]raid1: read balance chooses idlest disk for SSD

[Shaohua Li <shli@xxxxxxxxxx>]

2012/7/5 Roberto Spadim <roberto@xxxxxxxxxxxxx>:
> nice, just another question...
>  since this use mixed raid disks (different types) could we improve
> the algorithm to diferent hard disk speed, for example a raid1 with
> 7200 and 15000 rpm?
> the distance continue the same but it will include a 'speed' factor
> speed=1/rpm
> (distance*speed)
> or something to select fastest disk in the array
> i don´t want to use write-mostly since it can reduce my total number
> of read disks, but with this we could use the fastest disk with more
> frequency without lose array 'speed'

Legitimate optimization, however detecting hard disk speed is hard.
Or maybe you want to add an option to tell kernel the disk speed?

Thanks,
Shaohua
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