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From: "Brian J. Murrell" <brian@interlinx.bc.ca>
Date: Thu, 17 Dec 2009 18:41:23 -0500
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Subject: [linux-lvm] brainfart: lilo'd a PV
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I managed to write a lilo block (lilo) to the start of a PV which I have
on /dev/sda (note, /dev/sda is a whole disk PV, unpartitioned).

However, looking at a number of different PVs here, it appears that the
LVM data starts at 0x200 with: "LABELONE".  i.e.:

# hexdump -C /dev/sdc3
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |..............=
..|
*
00000200  4c 41 42 45 4c 4f 4e 45  01 00 00 00 00 00 00 00  |LABELONE......=
..|
...
# hexdump -C /dev/sdb
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |..............=
..|
*
000001b0  00 00 00 00 00 00 00 00  dc 59 0f 10 cf c9 00 00  |.........Y....=
..|
000001c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |..............=
..|
*
00000200  4c 41 42 45 4c 4f 4e 45  01 00 00 00 00 00 00 00  |LABELONE......=
..|
...
# hexdump -C /dev/sda=20
00000000  fa eb 31 12 00 00 4c 49  4c 4f 16 08 10 00 01 00  |..1...LILO....=
..|
...
00000180  30 e4 cd 13 eb 91 e8 93  fe 44 69 73 6b 20 72 65  |0........Disk =
re|
00000190  61 64 20 65 72 72 6f 72  0d 0a 00 00 00 00 00 00  |ad error......=
..|
000001a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |..............=
..|
000001b0  00 00 00 00 00 00 00 00  c6 08 1a 45 cf c9 00 00  |...........E..=
..|
000001c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |..............=
..|
*
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............=
U.|
00000200  4c 41 42 45 4c 4f 4e 45  01 00 00 00 00 00 00 00  |LABELONE......=
..|

Is that correct?

Is there anything I should do to repair this or is my brainfart benign
to this PV?

Thanx!

b.


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