Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

You can perform control operations from hosts connected any of the three arrays in a cascaded configuration.

Use the -hop2 option to control an SRDF device that is two hops away. The -hop2 option can be used with device groups, composite groups, STDs, and local BCVs.

Use the -hop2 option to control the:

• R21->R2 relationship for an RDF1 device group or composite group
• R1->R21 relationship for an RDF2 device group or composite group

The location of hop-2 devices depends on the location of the controlling host.

In the image above:

• When the controlling host is at Site A, a control operation with the -hop2 option acts on the device pair in the array from Site B to Site C.
• When the controlling host is at Site C, a control operation with the -hop2 option acts on the device pair in the array from Site B to Site A.

Examples

Use the -hop2 option with -rdfg name: to operate on the second hop SRDF relationship for the specified -rdfg name:.

In the following example a composite group has 4 devices spread across two arrays:

CG: testcg     cg type: RDF1   with  R1->R21->R2

Sym: 000192600284  / rdf group  210   /  rdfg name:  name1
R1 device  0380
R1 device  0381

Sym: 000192600256  / rdf group   60   /  rdfg name:  name1
R1 device  0940
R1 device  0941

The following command only operates on the R21->R2 SRDF relationships associated with all the R1 devices using SRDF groups named name1:

symrdf -cg testcg -rdfg name:name1 -hop2 establish