Hello,
I have the following problem with raid device (linear).
I can successfully create the linear device /dev/md0 this way
# mkraid --configfile ./rd.conf --really-force /dev/md0
disk 0: /dev/hda11, 4972086kB, raid superblock at 4971968kB
disk 1: /dev/hdc11, 3020188kB, raid superblock at 3020096kB
when the configfile is:
raiddev /dev/md0
raid-level linear
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/hda11
raid-disk 0
device /dev/hdc11
raid-disk 1
Then I try to do the two dd commands:
# dd if=/dev/md0 of=/dev/null bs=512 count=1 skip=9944158
1+0 records in
1+0 records out
# dd if=/dev/md0 of=/dev/null bs=512 count=1 skip=9944159
dd: reading `/dev/md0': Input/output error
0+0 records in
0+0 records out
Why does the second dd command fail? The size of /dev/md0 is about
7.9Gb, so why does dd fail on reading block with offset about ~5Gb?
In kernel logs I see the following:
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944152, count=24
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944152
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944154, count=22
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944154
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944156, count=20
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944156
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944158, count=18
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944158
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944160, count=16
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944160
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944162, count=14
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944162
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944164, count=12
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944164
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944166, count=10
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944166
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944168, count=8
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944168
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944170, count=6
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944170
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944172, count=4
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944172
Jan 16 21:59:39 flint kernel: hda;: bad access: block=9944174, count=2
Jan 16 21:59:39 flint kernel: end_request: I/O error, dev 03:0b (hda),
sector 9944174
I use kernel 2.4.24 and raidtools-1.00.3.
I checked /dev/hda11 and /dev/hdc11 by badblocks, and no bad blocks were
found on these devices.
Thank you very much for helping me.
Lena
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