Narrowing down the scope of the bug, the following two lines from the
kernel log confirm the reason:
[17179581.096000] end_request: I/O error, dev hde, sector 135202804
[17179581.096000] Buffer I/O error on device hde2, logical block 21510976
Bearing in mind the partition table on hde is actually the partition
table for the stripe-set hde+hdf, some entries in it will likely have
sector numbers that are larger than the number of sectors on the
physical drive hde, as can be seen from the partition table of the RAID
device after dmraid has loaded:
# fdisk -u -l /dev/mapper/pdc_biieicaii
Disk /dev/mapper/pdc_biieicaii: 121.9 GB, 121999982592 bytes
255 heads, 63 sectors/track, 14832 cylinders, total 238281216 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/mapper/pdc_biieicaii1 * 63 49158899 24579418+ 7
HPFS/NTFS
/dev/mapper/pdc_biieicaii2 49158900 135203039 43022070 7
HPFS/NTFS
/dev/mapper/pdc_biieicaii3 135203040 238276079 51536520 5
Extended
/dev/mapper/pdc_biieicaii5 135203103 141082829 2939863+ 82 Linux
swap / Solaris
/dev/mapper/pdc_biieicaii6 141082893 142094924 506016 83 Linux
/dev/mapper/pdc_biieicaii7 142094988 181181069 19543041 83 Linux
/dev/mapper/pdc_biieicaii8 181181133 238276079 28547473+ 83 Linux
So the logical sector 21,510,976 in hde2 is being sought, which is
physical sector 135,202,804, but hde only has 120,103,200 sectors.
The report of the logical sector number in 'hde2' suggests the issue is
caused by an fsck, although it doesn't explain why so many thousands of
errors are being generated.
There aren't an overwhelming number of seek errors, as shown by doing:
# grep 'end_request: I/O error, dev hde' dmesg.diskerrors.txt | sed
's/\(\[[0-9\.]*\]\) \([a-z]*\)/\2/' | sort | uniq
end_request: I/O error, dev hde, sector 135202804
end_request: I/O error, dev hde, sector 135202808
end_request: I/O error, dev hde, sector 135202972
end_request: I/O error, dev hde, sector 135202976
end_request: I/O error, dev hde, sector 135203028
end_request: I/O error, dev hde, sector 135203032
end_request: I/O error, dev hde, sector 135203036
end_request: I/O error, dev hde, sector 135203040
So, all but sector 135,203,040 are part of the NTFS file-system in
partition 2. That sector is the first sector of partition 3, which is an
extended partition-table entry.
--
Disk Read Errors during boot-time probe of physical softRAID drives
https://launchpad.net/bugs/77734
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