If a protection group contains only one Hitachi TrueCopy device group, then the aggregate device group state is the same as the individual device group state.
When a protection group contains multiple Hitachi TrueCopy device groups, the aggregate device group state is obtained as described in the following table.
Table 2–2 Conditions That Determine the Aggregate Device Group State
Condition |
Aggregate Device Group State |
---|---|
All individual device group states are SMPL |
SMPL |
All individual device group states are either Regular Primary or SMPL |
Regular Primary |
All individual device group states are either Regular Secondary or SMPL |
Regular Secondary |
All individual device group states are either Takeover Primary or SMPL |
Takeover Primary |
All individual device group states are either Takeover Secondary or SMPL |
Takeover Secondary |
The aggregate device group state cannot be obtained for any other combination of individual device group states. This is considered a pair-state validation failure.