[SATLUG] swapping 2 HDDs = problems

[Thomas Cameron]

I don't have an answer, but I saw something along the same lines several
months ago while studying for the RHCE exam.

I had a disk with logical volumes on it.  I was done with what I was doing
so I blasted the partition table by doing:

dd if=/dev/zero of=/dev/sda count=1

After I installed a new Linux version, my old logical volumes were still
seen, but I couldn't do anything to them!  I don't remember the specifics,
but I wound up having to define new logical volumes with the same names,
then remove them the "right way" instead of just nuking the partition
table.  That suggests to me that the logical volume info is stored on some
reserved area of the disk kind of like the partition table is.

Thomas