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    SubjectRe: 2.6.36 io bring the system to its knees
    Hi!

    > > > As already mentioned, ext3 is just not a good choice for this sort of
    > > > thing. Did you have atimes enabled?
    > >
    > > At least for ext3, more important than atimes is the "data=writeback"
    > > setting. Especially since our atime default is sane these days (ie if
    > > you don't specify anything, we end up using 'relatime').
    > >
    > > If you compile your own kernel, answer "N" to the question
    > >
    > > Default to 'data=ordered' in ext3?
    > >
    > > at config time (CONFIG_EXT3_DEFAULTS_TO_ORDERED), or you can make sure
    > > "data=writeback" is in the fstab (but I don't think everything honors
    > > it for the root filesystem).
    >
    > Don't forget to mention data=writeback is not the default because if
    > your system crashes or you lose power running in this mode it will
    > *CORRUPT YOUR FILESYSTEM* and you *WILL LOSE DATA*. Not to mention

    You will lose your data, but the filesystem should still be
    consistent, right? Metadata are still journaled.

    > the significant security issues (e.g stale data exposure) that also
    > occur even if the filesystem is not corrupted by the crash. IOWs,

    I agree on security issues.
    Pavel

    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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