Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Restrictions

• You can have either consistency protection or the domino effect mode enabled for a device, but not both.
• When a composite group is enabled for consistency protection:
  • Its name cannot be changed without first disabling the consistency protection. After the name change, re-enable the composite group using the new name.
  • If the composite group is enabled for SRDF/A consistency protection, the SRDF daemon immediately begins cycle switches on the SRDF groups within the composite group (or named subset).

    The cycle switches for all SRDF groups will be performed at the same time. The interval between these cycle switches is determined by the smallest minimum cycle time defined on the R1 SRDF groups in the composite group (or named subset).

    The smallest minimum cycle time supported by the SRDF daemon is 3 seconds. This value is used if the smallest minimum cycle time across all component groups is less than 3 seconds.

• If you change the minimum cycle time for any of the R1 SRDF groups while the composite group (or named subset) is enabled for SRDF/A consistency protection, the new minimum cycle time will not take effect until you disable consistency protection and then re-enable it.
• You can change contents of a composite group by doing one of the following:
  • Disable consistency protection on a composite group while you add or remove devices, and then re-enable consistency protection after editing the composite group.

    Devices in the composite group are unprotected during the time required to edit and then re-enable the composite group.

  • For RDF1 composite groups, you can dynamically modify the composite group while maintaining consistency protection during the editing process.

    Modify consistency groups provides more information.