# [OmniOS-discuss] ZFS panic when unlinking a file

Omen Wild omen.wild at gmail.com
Tue Sep 15 17:13:11 UTC 2015

- Previous message: [OmniOS-discuss] (no subject)
- Next message: [OmniOS-discuss] ZFS panic when unlinking a file
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

    Quoting Stephan Budach <stephan.budach at JVM.DE> on Tue, Sep 15 06:59:
    >
    > Am 15.09.15 um 03:46 schrieb Paul B. Henson:
    > >>From: Omen Wild
    > >>Sent: Monday, September 14, 2015 3:10 PM
    > >>
    > >>Mostly we are wondering how to clear the corruption off disk and worried
    > >>what else might be corrupt since the scrub turns up no issues.
    > >While looking into possible corruption from the recent L2 cache bug it seems
    > >that running 'zdb -bbccsv' is a good test for finding corruption as it looks
    > >at all of the blocks and verifies all of the checksums.

    I have kicked that off. I expect it will take a while as the pool has
    15.6TB of data.

    > 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.

    We have no l2arc on this machine, so I don't believe 6214 will impact
    us. When the corruption first manifest itself we were running an
    update from July (2015-07-20T14:15:58) with
    pkg://omnios/system/file-system/zfs@0.5.11,5.11-0.151014:20150402T175233Z

    > I think, the best one can do is to run a scrub and act on the results of
    > that. If scrub reports no errors, one can live with that or one would need
    > to think of options to reference the data with known, good data 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.

    The 'zpool scrub' was clean, no errors. unlinking the file still causes
    the panic. I will report the results of the zdb when it finishes.

    Thanks for the ideas.

- Previous message: [OmniOS-discuss] (no subject)
- Next message: [OmniOS-discuss] ZFS panic when unlinking a file
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

More information about the OmniOS-discuss mailing list