Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

To create SRDF devices in an SRDF/Metro configuration, use the -metro option with the createpair command.

The symrdf createpair command allows creating a concurrent RDF device resulting in one SRDF/Metro mirror and one Asynchronous or Adaptive Copy RDF mirror.

The createpair -format -metro command allows creating devices into an non-empty SRDF/Metro group when the existing devices are RW on the link. The devices that are being added will be formatted as a part of the createpair.

The createpair -metro -invalidate R1 [or R2] command allows adding devices to a non-empty SRDF/Metro group when the group is suspended (all devices already in the group are NR on the link). Data on the devices being added is preserved (-invalidate R2 preserves the R1 data; -invalidate R1 preserves the R2 data).

The symrdf createpair -metro -exempt command allows creating device pairs that get special handling allowing devices to be added without affecting the state of the SRDF/Metro session or requiring that other devices in the session be suspended. -exempt also allows creating device pairs whose R1 and/or R2 sides are not aligned with those of devices already in the group; SRDF/Metro sets alignments to match when the devices become Ready (RW) on the link.

Even if the device pairs are being created in an existing SRDF/Metro group, the -metro option is still necessary.

Use the -use_bias option to indicate that the SRDF/Metro configuration uses Device Bias rather than either form of witness protection. This is only valid with the -establish or -restore options.

When using the createpair operation with the -establish or -restore options the following rules apply when a witness method is in use:

• In an Array Witness configuration, the required Witness SRDF groups must exist and be online.
• In a vWitness configuration, both arrays must be connected to the same vWitness instance and that instance must be active.

Options

Restrictions

Examples

symrdf createpair -metro -sid 174 -type R1 -rdfg 2 -sg RDF1_SG -remote_sg RDF2_SG –establish

Execute an RDF 'Create Pair' operation for storage group 'RDF1_SG' (y/[n]) ? y

An RDF 'Create Pair' operation execution is
in progress for storage group 'RDF1_SG'. Please wait...

    Create RDF Pair in (0174,002)....................................Started.
    Create RDF Pair in (0174,002)....................................Done.
    Mark target device(s) in (0174,002) for full copy from source....Started.
    Devices: 006B-0074 in (0174,002).................................Marked.
    Mark target device(s) in (0174,002) for full copy from source....Done.

In the following example, the createpair command:

• Creates device pairs using device pairs listed in a device file /tmp/device_file.
• Specifies the pairs are in a SRDF/Metro configuration (-metro) .
• As with the previous example, this createpair operation omits the -use_bias option; hence a witness array or vWitness is required.

symrdf createpair -est –f /tmp/device_file -metro –sid 085 -type R1 –rdfg 86