Re: [Fwd: Re: 2.5.24-dj1,smp,ext2,raid0: I got random zero blocks in my

[Helge Hafting]

Helge Hafting wrote:
> 
> -------- Original Message --------
> Subject: Re: 2.5.24-dj1,smp,ext2,raid0: I got random zero blocks in my
> files.
> Date: Mon, 01 Jul 2002 01:18:20 -0700
> From: Andrew Morton <[e-mail]>
> To: Helge Hafting <[e-mail]>
> CC: [e-mail], [e-mail],[e-mail]
> References: <[e-mail]>
> 
> Helge Hafting wrote:
> >
> > 2.5.24-dj1 gave me files with zeroed blocks inside.
[...]
> > The filesystems use 4k blocks.
> > I haven't seen any trouble on non-raid or raid-1
> > partitions.
> 
> Yes, the large BIO stuff went into 2.5.19.  RAID0 doesn't
> like those big BIOs.  Jens is cooking up a fix for that.
> 
> Just to confirm that this is the problem, could you please
> set MPAGE_BIO_MAX_SIZE in 32768 in fs/mpage.c and see if the
> failure goes away?

I tried that, and it didn't help.  Could this be as simple
as non-aligned 32k requests?  A size limit might not be
enough if the request starts in the middle of one stripe
extending into the next?

I got lots of these,
monster kernel: raid0_make_request bug: can't convert block across
chunks or bigger than 32k 2944376 32

and untarred files with strings of zeroes in them.  One
file had several sets of zeroes.

Helge Hafting