Mirroring

mklv -y (lv) -c(copies 2 or 3) (vg) (No of PP's) (PV Name optional)
Creates a mirrored named logical volume.

mklvcopy -s n (lv) (copies 2 or 3) (pv)
Creates a copy of a logical volume onto another physical volume. The physical
volume MUST be in the same volume group as the orginal logical volume !

rmlvcopy (lv) (copies 1 or 2)             Removes logical volume copies.
rmlvcopy (lv) (copies 1 or 2) (pv)        From this pv only!

syncvg -p (pv)                            Synchronize logical partion copies
syncvg -l (lv)
syncvg -v (vg)

mirrorvg (vg) (pv)                
Mirrors the all the logical volumes in a volume group onto a new physical
volume. New physical volume must already be part of the volume group.

chfs -a splitcopy=/backup -a copy=2 /data1
Splits off a copy of a 3 way mirror and mount read only for use as an