Re: Errors and later panics in 2.6.0-test11.

[Nathan Scott]

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@xxxxxxx)
> >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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