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SubjectRe: Define conflict between ext3 and raid patches against 2.2.19
On Fri, Sep 21, 2001 at 02:10:50PM +0100, Stephen C. Tweedie wrote:
> Hi,
>
> On Thu, Sep 20, 2001 at 08:35:04AM +1000, Neil Brown wrote:
>
> > However when a RAID rebuild happens, every block on the array is read
> > into the buffer cache (if it isn't already there) and then written
> > back out again. This defeats the control that ext3 tries to maintain
> > on the buffer cache.
> >
> > I don't know exactly what large-scale effects this might have. It
> > could be simply that a crash at the wrong time could leave the
> > filesystem corrupted.
>
> Immediately after a crash, the fs will be OK. But during the
> subsequent background raid reconstruction, it can get out of sync
> again. This can result in silent data loss in some cases, but it is
> also likely to trigger some internal ext3 debugging which detects
> out-of-order data writes, resulting in a kernel panic.
>

Ok, thanks guys, on ext3-users and lkml.

Now I know that if I want RAID1 or RAID5 with ext3, I'm going to need 2.4...

Test test test...

Mike
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