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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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