12.2. Sun disk labels
You need to be especially careful on SPARC systems where the disks
have Sun disk labels on them.
The normal layout for a Sun disk label is for the first partition
to start at block zero of the disk, thus the first partition also
covers the area containing the disk label itself. This works fine
for ext2 filesystems (and is essential for booting using SILO) but
such partitions should not be used for LVM. This is because LVM
starts writing at the very start of the device and will overwrite
the disk label.
If you want to use a disk with a Sun disk label with LVM, make sure
that the partition you are going to use starts at cylinder 1 or