On Saturday July 1, [email protected] wrote:
> >>
> >> md: super_written gets error=-5, uptodate=0
> >>
> >> messages on the console that didn't seem to want to stop...
> >
> > '5' == EIO
> >
> > We try to write the superblock and we get EIO - something wrong somewhere.
> >
> > What sort of device are we writing to here? What controller, what
> > driver (if you know), what drives?
>
> The two raid-1 disks are the Seagate ST380817AS SATA disks on the onboard
> controller. The motherboard is an Intel D945GNT motherboard. See dmesg..
>
> > Can you write to the device without using md?
>
> Yes.
>
So... When md writes a superblock to this device, it reliably (or
close to reliably) gets EIO. When mkfs writes, it works fine.
Only difference I can think of is still barriers... Does this patch
make any difference?
NeilBrown
(For readers on linux-kernel who are wondering where the history of
this thread is - you won't find it. We were having a discussion in
private and finally got embarrassed about keeping such gems to
ourselves so we decided to share)
Signed-off-by: Neil Brown <[email protected]>
### Diffstat output
./drivers/md/md.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c 2006-07-01 12:12:14.000000000 +1000
+++ ./drivers/md/md.c 2006-07-01 20:48:44.000000000 +1000
@@ -454,7 +454,7 @@ void md_super_write(mddev_t *mddev, mdk_
bio->bi_rw = rw;
atomic_inc(&mddev->pending_writes);
- if (!test_bit(BarriersNotsupp, &rdev->flags)) {
+ if (0 && !test_bit(BarriersNotsupp, &rdev->flags)) {
struct bio *rbio;
rw |= (1<<BIO_RW_BARRIER);
rbio = bio_clone(bio, GFP_NOIO);
-
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