Messages in this thread |  | | Date | Tue, 02 Oct 2001 01:17:55 +0400 | From | Hans Reiser <> | Subject | Re: Define conflict between ext3 and raid patches against 2.2.19 |
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More precisely, as long as you understand that resync requires doing the resync offline, and accept that, and remember it, and your colleagues at work remember it:-), you can use it. Personally, I would just go to 2.4 myself.
Hans
Neil Brown wrote: > > On Wednesday September 19, mfedyk@matchmail.com wrote: > > On Tue, Sep 18, 2001 at 09:08:32PM +1000, Neil Brown wrote: > > > > > > You should be aware that ext3 (and other journalling filesystems) do > > > not work reliably over RAID1 or RAID5 in 2.2. Inparticular, you can > > > get problems when the array is rebuilding/resyncing. > > > > > > But if you only plan to use ext3 with raid0 or linear, you should be > > > fine. > > > > > > > Can you point me to an archive that describes how to trigger this bug? > > > > Was it in linux-raid or ext3-users or ...? > > > > Mike > > I don't remember exactly where or when I read it - either linux-raid > or linux-kernel. It was asserted by Stephen Tweedie. > > The problem is that ext3 is very careful about when it writes buffer > to disk : it won't release a buffer until the relevant journal entry > is committed. > > 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. But I heard of one person who claimed to get > filesystem corruption after using reiserfs over RAID1 in 2.2, so maybe > it's worse than that. > > If you really need to know, I suggest you ask on ext3-users. > > NeilBrown > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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