Mon Jul 6 16:12:37 CEST 2009

LVM leaky abstraction

So.. LVM is supposed to rid you of all partion problems.  However,
when creating a mirror you do need an extra PV for the log.  This
means you need to thing _ahead_ about how many mirrored LVs you are
going to create.

The simplest way is to reserve a part of a disk with a couple of small
logical partitions to store these logs.

It seems possible to initialize LVs as PVs, but I did get a warning
that I tried to do this within the same group.  So it looks like they
can probably be stacked, as long as it's not done circularly.