Tejun Heo writes:
Sounds awfully similar to the recent nvidia data corruption issue. It
was involving the IOMMU and one of the workarounds was not using IOMMU,
IIRC. Please turn off IOMMU and see what happens. You can turn IOMMU
off by passing "iommu=off" as kernel parameter.
--
tejun
Blast. I stand corrected - it didn't fix it.
I now have 3 300G drives hanging off the add-in card, sda sdb sdc. I did
the following:
# Make a RAID5 array of 3 out of the 4 drives I'll eventually be using
mdadm --create /dev/md6 --chunk=64 --level=raid5 --raid-devices=4 /dev/sda1
/dev/sdb1 /dev/sdc1 missing
# Make the FS
mkfs.ext3 /dev/md6
# Test
cp KNOPPIX_V5.1.0CD-2006-12-30-EN.iso kn1.iso
cp kn1.iso kn2.iso
cp kn2.iso kn3.iso
cp kn3.iso kn4.iso
# Check
md5sum *.iso
eea5ecb53f1c6a397bcfeedc2fd42c64 kn1.iso
0360941210aa2d7159999e37c636f8cb kn2.iso
md5sum: kn3.iso: Input/output error
86b008915fe02569a513b6c5ec45a523 kn4.iso
In the dmesg:
[ 2619.483783] attempt to access beyond end of device
[ 2619.483956] md6: rw=0, want=25890291976, limit=1758201216
[ 2619.484121] attempt to access beyond end of device
[ 2619.484284] md6: rw=0, want=30654872552, limit=1758201216
[ 2619.484452] attempt to access beyond end of device
[ 2619.484614] md6: rw=0, want=33748316016, limit=1758201216
[ 2619.484780] attempt to access beyond end of device
[ 2619.484943] md6: rw=0, want=7818926368, limit=1758201216
[ 2619.485122] attempt to access beyond end of device
[ 2619.485285] md6: rw=0, want=32912340352, limit=1758201216
[ 2619.485451] attempt to access beyond end of device
[ 2619.496228] md6: rw=0, want=2277136440, limit=1758201216
[ 2619.496394] attempt to access beyond end of device
[ 2619.496557] md6: rw=0, want=2128357688, limit=1758201216
[ 2619.529625] attempt to access beyond end of device
[ 2619.530392] md6: rw=0, want=25890291976, limit=1758201216
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