Hi, On Tue, May 21, 2002 at 04:30:49PM +1000, Neil Brown wrote: > The directories haven't been moved from buffercache to > pagecache between 2.4.16 and 2.4.18 or anything like that have they? No, no big changes. > My ext3 filesystem is on a raid5 array, with the journal on > a separate raid1 array. (data=journal mode). Not a configuration I've tested, but I can set up a box here with that config and see if I can reproduce any problems. > I get quite a few messages in the logs which say: > > May 21 14:20:06 glass kernel: raid5: multiple 1 requests for sector 7540536 Can you go into debugfs and find out what inode that sector belongs to? You'll need to convert it into a block number first, then use "icheck". > For a variety of sector numbers. > This means that raid5 has received two separate write requests, with > two separate buffer heads, for the same sector. This seems like a > filesystem error to me. Probably, yes. Is this a SMP box? I recently fixed a long-standing bug which could cause that on SMP; it would be worth seeing if the ext3-0.9.18 I posted fixes the problems. Are you running dump(8)? If so, it could actually be a read request from dump colliding with a write request from the fs; add_write_bh() doesn't seem to distinguish between reads and writes when warning about IO collisions. Otherwise, I'd really like to track this down by turning the raid warning into a BUG() or BH_ASSERT(), and enable buffer tracing. (In fact I can probably do that non-destructively, by calling the buffer trace printing manually from add_stripe_bh().) Cheers, Stephen
