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    SubjectRe: [PATCH] scsi/sata write barrier support
    On Thu, Jan 27 2005, Jeff Garzik wrote:
    > Doug Maxey wrote:
    > >On Thu, 27 Jan 2005 13:02:48 +0100, Jens Axboe wrote:
    > >
    > >>Hi,
    > >>
    > >>For the longest time, only the old PATA drivers supported barrier writes
    > >>with journalled file systems. This patch adds support for the same type
    > >>of cache flushing barriers that PATA uses for SCSI, to be utilized with
    > >>libata.
    > >
    > >
    > >What, if any mechanism supports changing the underlying write cache?
    > >
    > >That is, assuming this is common across PATA and SCSI drives, and it is
    > >possible to turn the cache off on the IDE drives, would switching the
    > >cache underneath require completing the inflight IO?
    > [ignoring your question, but it made me think...]
    > I am thinking the barrier support should know if the write cache is
    > disabled (some datacenters do this), and avoid flushing if so?

    Ehm it does, read the code :)

    Jens Axboe

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