Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

The consistency feature ensures the dependent-write consistency of the data distributed across multiple R1 devices. The R1 and R2 devices can be distributed across multiple primary and secondary arrays.

Consistency groups are groups of SRDF devices enabled for database consistency. SRDF devices that belong to the same consistency group act in unison to preserve dependent-write consistency of a database distributed across multiple devices within the consistency group.

The consistency group ensures that remote mirroring is suspended for all SRDF devices in a consistency group as soon as one SRDF device in the group fails to send data across the SRDF links.

• Use the enable argument to enable consistency protection for devices in SRDF/Asynchronous mode by device group or device list.

  When consistency is enabled, and data cannot be copied from the R1 to the R2, all devices in the group will be made not ready on the links.

• Use the disable argument to disable consistency protection for devices in SRDF/Asynchronous mode by device group or device list.

  When consistency is disabled, and data cannot be copied from the R1 to the R2, only the devices in the group that are experiencing problems will be made not ready on the links. The device state for any remaining devices in the group will remain the same.