This object reports whether a partition's data is mirrored to the standby disk when network redundancy is configured: enabled(1), disabled(2), or notApplicable(3) if the group isn't in a redundancy mode where mirroring applies. An admin checks this to confirm critical partitions are actually being mirrored for protection against card failure. For example, a value of disabled(2) on a partition expected to be protected would alert the admin that mirroring isn't active as intended.