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    SubjectRe: [PATCH 5/7] vfs: Add wbcflush sysfs knob to disable storage device writeback cache flushes
    Jens Axboe wrote:
    > On Mon, Mar 30 2009, Bartlomiej Zolnierkiewicz wrote:
    >> On Monday 30 March 2009, Fernando Luis Vázquez Cao wrote:
    >>> Add a sysfs knob to disable storage device writeback cache flushes.
    >> The horde of casual desktop users (with me included) would probably prefer
    >> having two settings -- one for filesystem barriers and one for fsync().
    >> IOW I prefer higher performance at the cost of risking losing few last
    >> seconds/minutes of work in case of crash / powerfailure but I would still
    >> like to have the filesystem in the consistent state after such accident.
    > The knob is meant to control whether we really need to send a flush to
    > the device or not, so it's an orthogonal issue to what you are talking
    > about. For battery backed caches, we never need to flush. This knob is
    > useful IFF we have devices with write back caches that STILL do a cache
    > flush.

    How do installers and/or kernels detect a battery-backed cache that does
    not need flush?


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