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    SubjectRe: Strage buffer behaviour
    Date
    On Sunday 11 November 2007 11:33, Tino Keitel wrote:
    > The dd command reads 100 MB from each partition two times in a row. It
    > looks like sda1 and sda2 are not bufferd (the first 4 dd runs), but
    > sda3 and sda4 are (the last 4 dd runs).
    >
    > The computer is a Mac mini with a 2,5" SATA hard disk. The first 2
    > partitions contain EFI and MacOS X, and are unused in Linux. The last 2
    > partitions are an ext3 partition for / and an LVM for the rest of the
    > sytem.
    >
    > Any hints how the dd/buffering behaviour could be explained? The system
    > was mostly idle, and the numbers are reproducible across reboots.

    IIRC only mounted partitions' reads are cached.
    --
    vda
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