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SubjectRe: questions about io scheduler


Mike Fedyk wrote:
> Nick Piggin wrote:
>
>>
>>
>> Kyle Wong wrote:
>>
>>> 2. Does io scheduler works with md RAID? Correct me if I'm wrong,
>>> io-schedular <--> md driver <--> harddisks.
>>>
>>>
>>
>> It goes md driver -> io schedulers -> hard disks.
>
>
> There is an IO scheduler per disk.
>
> So MD submits the data to each disk through the IO scheduler.
>
> This allows you to have the heads on each disk in the array at different
> locations, and helps keep response times lower for seeky loads.

Say you've got a RAID1. In this case, MD could send the read request to
either device. How does it decide which one to use?


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