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    SubjectRe: Massive e2fs corruption with 2.2.9/10?
    On Thu, 17 Jun 1999, Larry McVoy wrote:

    > If you pick up
    > you will get a Linux binary and the source code (the only docs that are current,
    > I'm afraid) for a tool which was designed to deal with this problem. You
    > can do this
    > lmdd of=XXX bs=10m move=120m opat=1
    > To read it back and make sure the pattern is there
    > lmdd if=XXX bs=10m move=120m ipat=1
    > You can also read it back using random offsets within the file, something
    > which sometimes catches an error or two:
    > lmdd if=XXX bs=512 rand=120m count=1000 ipat=1

    I grabbed a copy of lmdd and tried it on:

    - dual-PII SMP, 128MB Mem, 2 x 333Mhz.
    on-board Adaptec two-ch. AIC7895 UW controller
    RedHat 5.2 Install
    2.2.10-ac1 kernel

    (hirsch@pii) /tmp : lmdd of=test1.file bs=10m move=500m opat=1
    524.2880 MB in 34.1190 secs, 15.3665 MB/sec

    (hirsch@pii) /tmp : lmdd if=test1.file bs=10m move=500m ipat=1
    524.2880 MB in 30.9426 secs, 16.9439 MB/sec

    (hirsch@pii) /tmp : lmdd if=test1.file bs=10m rand=500m ipat=1
    (hang on, it's still churning away while I type this on the same box).
    (still going? I'll web-surf a bit..)
    ( ok, the heck with it..)
    10825.4986 MB in 735.9394 secs, 14.7098 MB/sec

    Hey, Larry, I though it was supposed to stop on its own after 500MB? <g>

    Anyway, as you'll see, I was unable to trip anything up. Maybe the
    corruption is some sort of IDE thing?


    p.s. - Larry, thanks for slinging this out there!

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