You cannot close your current archive with a Historian Mirror Primary Server and
Historian Mirror Node installation. This is because closing the current archive
introduces archive synchronization risks in a mirrored environment. The
restriction is enforced on all Historians, even those not using mirroring.
You cannot use size-based archives with a Historian Mirror Primary Server and
Historian Mirror Node installation. This is because having archives of different
sizes introduces archive synchronization risks in a mirrored environment. The
restriction is enforced on all Historians, even those not using mirroring.