Re: Errors and later panics in 2.6.0-test11.

From: Nathan Scott (nathans_at_sgi.com)
Date: 12/05/03

  • Next message: David Dillow: "[BK PATCH 0/3] Teach kbuild to pull files from BK repository" 
    Date:	Fri, 5 Dec 2003 14:20:23 +1100
To: "Kevin P. Fleming" <kpfleming@backtobasicsmgmt.com>

    On Wed, Dec 03, 2003 at 10:25:27AM -0700, Kevin P. Fleming wrote:
    > Linus Torvalds wrote:
    >
    > >The ones I've seen seem to be raid-0, but Nathan (nathans@sgi.com)
    > >reported problems in RAID-5 under load. I didn't decode the full oops on
    > >that one, but it really looked like a stale "bi" bio that trapped on the
    > >PAGE_ALLOC debug code.
    >
    > The problem I reported was also with RAID-5, and I have also found a
    > problem similar to Nathan's (probably the same one) by just trying to
    > run bonnie++ on an XFS filesystem on DM over RAID-5, even after
    > formatting the XFS filesystem to forcibly align everything to RAID-5
    > stripes (64K units).

    FWIW, this doesn't align _everything_ (space allocations done
    through the XFS allocator are influenced, which means "most")
    -- log IO is still going to be sector aligned, as are any IOs
    to the four XFS allocation group header metadata structures.

    cheers. 

    -- 
Nathan
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