Mirrored protection configuration errors

There can be no missing, active disk units anywhere in the configuration when mirroring is being started. Units with a status of missing must be powered, repaired, or replaced.

Starting mirrored protection can fail if there is insufficient storage available in the auxiliary storage pool (ASP) to contain the current data in the ASP. The percentage that is used in the ASP must normally be less than half of the ASP threshold. The exception to this occurs when the ASP contains device parity protected disk units that can allow starting mirrored protection with a greater percent used.

There must be sufficient storage units in the ASP for the system to create mirrored pairs. If you receive a message that indicates that the system cannot pair unit 1 or other units, see the Mirrored protection: Configuration rules topic.