You can use the vx_emerg_start utility to start VxVM after booting a system from recovery media. This command allows a rootable VxVM configuration to be repaired in the event of a catastrophic failure.
To start VxVM after booting from recovery media
# vx_emerg_start hostname
The hostname argument specifies the name (node name) of the system that you are repairing. This name must match the name of the system that you are repairing, because it is unlikely to be recorded on the recovery media from which you booted the system.