[linux-lvm] LVM2 striping or md raid0

[Kelly Byrd <kbyrd-lvm memcpy com>]

Two questions really:

I'm going to use lvm to partition up 4 equal size partitions.
I can either use the md driver to RAID0 them the make /dev/md0
my PV, or just use the 4 partitions as PVs and stripe across
them.

How does lvm2 striping compare with md's RAID0 as far as speed?
I don't quite get how it stripes on chunk sizes smaller than
a PE, but a 4MB stripe size seems crazy.

Finally, what's the tuning advice for LVM2 striping? I usually
create my RAID0 or RAID5 with 128k chunk sizes, is it similar
for LVM2 striping?