Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Syntax

When the same consistency group is defined on multiple hosts, you can initiate a suspend operation from any host provided the consistency group is enabled.

Consistency protection is automatically restored upon resumption of the link.

Consistency protection is not disabled unless you specify symcg -cg disable.

Use the suspend, split or failover commands to suspend consistency protection for all devices in an SRDF consistency group where all devices are either synchronous or asynchronous.

For asynchronous replication, use the symrdf -cg verify command with the -cg_consistent option to ensure that the SRDF consistency group is SRDF-consistency enabled and in a consistent state.

A consistent state means that at least two cycle switches have occurred and all devices in each SRDF (RA) group have reached a consistent state.

The state of the R2 devices at the end of the deactivation varies depending on whether the suspend or split command is used:

Options

The state of the R2 devices at the end of the deactivation varies depending on whether the suspend or split command is used:

symrdf -cg suspend

The R2 devices are in the write disabled state and cannot be accessed by the target-side hosts. R2 database copy is consistent with the production copy on the R1 side.

symrdf -cg split

The R2 devices are enabled for both reads and writes by the target-side hosts.

Examples

To deactivate consistency in a consistency group named ConsisGrp:

symrdf -cg ConsisGrp suspend -force

To resume the SRDF links between the SRDF pairs in the SRDF consistency group and I/O traffic between the R1 devices and their paired R2 devices:

symrdf -cg ConsisGrp resume