| Description | Indicates whether this is the primary redundant unit or
not. If this unit is the primary unit, this object is true. If
this unit is the secondary unit, this object is false.
Note that the terms 'primary/secondary' are not synonymous
with the terms 'active/standby'. At any given time, the
primary unit may be the active unit, or the primary unit may
be the standby unit. Likewise, the secondary unit, at any
given time, may be the active unit, or the secondary unit may
be the standby unit.
The primary unit is given a higher priority or precedence over
the secondary unit. In a race condition (usually at
initialization time) or any situation where the redundant
units are unable to successfully negotiate activity between
themselves, the primary unit will always become the active
unit and the secondary unit will fall back to standby. Only
one redundant unit can be the primary unit at any given time.
The algorithm for determining the primary unit is system
dependent, such as 'the redundant unit with the lower numeric
unit id is always the primary unit.' |