Veritas Volume Manager 

1) To add disk to the existing diskgroup

vxdg -g dg adddisk d1=c0t0d1

(Creating a volume)

vxassist -g dg make con 200m;

(creating a vxfs filesystem)

 vxprint -hvpst | grep conmkfs -F vxfs /dev/vx/rdsk/dg/con

(mounting)

 mount -F vxfs /dev/vx/dsk/dg/con /con

Mirroring the plex/volume ( Minimum two plexes are required for mirroring) 

#vxassist -g dg mirror con  (creates 2nd volume/plex automatically)

vxprint -hvpst
 

2) Bringing the volume from mirror state to concat state

vxplex -g dg dis con-02   (disassociating plex from mirror and then remove the volume)
vxprint -vpvst
vxedit -g dg  -rf rm con-02  (it deletes though the plex has associated subdisks)
vxprint -hvpst
 

3) Relayout from concat to stripped

vxassist -g dg relayout con layout=stripe stwidth=32k ncols=2 (ncols=number of subdisks in each plex)
vxassist -g dg relayout con layout=concat
vxprint -hvpst
 

4) concat to stripped-mirror volume

vxassist -g dg relayout con layout=stripe-mirror stwidth=32k ncols=2