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    SubjectRe: Trashing ext2 with hdparm

    No way that this could cause corruption it is a read-only test.

    On Wed, 6 Dec 2000, Udo A. Steinberg wrote:

    >
    > Hi,
    >
    > Following the discussion in another thread where someone
    > reported fs corruption when enabling DMA with hdparm, I've
    > played around with hdparm and found that even the rather
    > harmless hdparm operations are capable of trashing an ext2
    > filesystem quite nicely.
    >
    > hdparm version is 3.9
    >
    > hdparm -tT /dev/hdb1 does the trick here.
    >
    > After that, several files are corrupted, such as /etc/mtab.
    > Reboot+fsck fixes the problem, however e2fsck never finds
    > any errors in the fs on disk.
    >
    > I'm quite sure that earlier kernel versions didn't exhibit
    > this kind of behaviour, although I'm not quite sure at
    > which point things started to break. I have test12-pre6
    > here atm, but I have test-11 still lying around and will
    > test that in a bit.
    >
    > The drive in question is an IBM-DTLA307030 running in
    > UDMA Mode 5 on a PDC20265, chipset revision 2.
    >
    > I haven't seen any other corruption other than that which
    > hdparm reliably triggers. Might as well be a bug in hdparm,
    > so someone else might also want to check...
    >
    > -Udo.
    > -
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    > Please read the FAQ at http://www.tux.org/lkml/
    >

    Andre Hedrick
    CTO Timpanogas Research Group
    EVP Linux Development, TRG
    Linux ATA Development

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