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    SubjectRe: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)
    > Writeback cache on disk in iteself is not bad, it only gets bad if the
    > disk is not engineered to save all its dirty cache on power loss,
    > using the disk motor as a generator or alternatively a small battery.
    > It would be awfully nice to know which brands fail here, if any,
    > because writeback cache is a big performance booster.

    AFAIK no drive saves the cache. The worst case cache flush for drives is
    several seconds with no retries and a couple of minutes if something
    really bad happens.

    This is why the kernel has some knowledge of barriers and uses them to
    issue flushes when needed.

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      Last update: 2008-01-16 01:21    [W:0.026 / U:0.928 seconds]
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