echo y | mdadm -C /dev/md9 -n2 /dev/sda11 /dev/sdb11 -l0
pvcreate /dev/md9
vgcreate test /dev/md9
vgdisplay | grep 'Total PE'
  Total PE              1686
lvcreate -i2 -l1686 -nlogvol test 
  Using default stripesize 64,00 KB
  Number of stripes (2) must not exceed number of physical volumes (1)
//ooops! :) //
lvcreate  -l1686 -nlogvol test 
  Logical volume "logvol" created

mkfs.xfs /dev/test/logvol
mount /dev/test/logvol /test
time cp /test.rnd /test

real    0m54.547s
user    0m0.046s
sys     0m7.118s

sync

time mv /test.rnd /test

real    0m46.863s
user    0m0.067s
sys     0m7.045s

sync

time mv /test/test.rnd /

real    1m27.282s
user    0m0.063s
sys     0m13.456s


BOTTOM LINE:

(LVM and RAID-0 are taken rom the prev. tests. The new one here is only RAID-0+LVM)

cp /test.rnd /test
LVM:      20.78 [MB/s]
RAID-0:   33.41 [MB/s]
RAID+LVM: 27.49 [MB/s]

mv /test.rnd /test

LVM:      29.04[MB/s]
RAID-0:   31.56[MB/s]
RAID+LVM: 32.00 [MB/s]

time mv /test/test.rnd /
LVM:      17.089 [MB/s]
RAID-0:   27.84[MB/s]
RAID+LVM: 17.185 [MB/s]