# [OmniOS-discuss] (no subject)

Paul B. Henson henson at acm.org
Tue Sep 15 20:24:22 UTC 2015

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    > From: Stephan Budach
    > Sent: Monday, September 14, 2015 10:00 PM
    >
    > As George Wilson wrote on the ZFS mailing list: " Unfortunately, if the
    > corruption impacts a data block then we won't be able to detect it.".
    > So, I am afarid apart from metadata and indirect blocks corruption,
    > there's no way to even detect a corruption inside a data block, as the
    > checksum fits.

    Yes, that's true, assuming you have no external source of verification.
    However, Arne said he didn't think this bug would result in data corruption,
    only metadata corruption. I was mostly worried about pool corruption that
    would cause panics or failure to import, which data level corruption would
    not cause. Most of the data on the pool I was worried about is media, a bad
    data block here or there wouldn't be too tragic.

    > from that pool, e.g. from a backup prior to 6214 having been introduced,
    > but depending on the sheer amount of data or the type of it, that might
    > not be even possible.

    Yup. This was a sucky bug :(.

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