Values:
UNDEFINED_STATE (0):
A value indicating that the enum field is not
set.
ACTIVE (314733318):
Replication is active.
CREATED (135924424):
Secondary disk is created and is waiting for
replication to start.
STARTING (488820800):
Replication is starting.
STATE_UNSPECIFIED (470755401):
No description available.
STOPPED (444276141):
Replication is stopped.
STOPPING (350791796):
Replication is stopping.