Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Use the following command to pair devices in the local storage group and RDF group with devices in the specified remote storage group and RDF group located at hop 2:

symrdf -sg SgName -sid SID -rdfg GroupNum -remote_sg SgName createpair -type {r1|r2} -hop2 -hop2_rdfg GroupNum

To create pairs using the -hop2 option:

• Devices in the remote storage group must have 2 RDF mirrors and the operation is performed on the other mirror.
• Devices in the remote storage group cannot be R21, R22, or R11 devices before the createpair operation.
• The remote storage group must already exist.

Example

The following example creates an R1 -> R21 -> R2 configuration starting with an R1 -> R2 pair.

Before the operation, the storage group SG_ABC in RDF group 16 on local SID 085 contains 2 R1 devices:

---------------------------------------------------------
Sym                            Device                Cap
Dev      Pdev Name             Config       Sts      (MB)
---------------------------------------------------------
01AA0    N/A                   RDF1+TDEV    RW       3278
01AB1    N/A                   RDF1+TDEV    RW       4125

These are paired with 2 R2 devices in storage group SG_ABC on remote SID 086 (hop 1):

Logical      Sym     T     R1 Inv R2 Inv K Sym T...
Device       Dev     E     Tracks Tracks S Dev E...
--------------------------------- -- --------...
N/A          01AA0  RW     0      0  NR 0007A WD...
N/A          01AB1  RW     0      0  NR 0007B WD...

On the remote SID 087 (hop 2), storage group SG_ABC_HOP2 in RDF group 6 contains two unpaired devices:

Sym                            Device                Cap
Dev     Pdev Name              Config     Sts        (MB)
---------------------------------------------------------
0009A   N/A                    TDEV       RW         3278
0009B   N/A                    TDEV       RW         4125

The following command creates an R1 -> R21 -> R2 configuration. The devices at hop 2 (SID 087) become R2 devices:

symrdf -sg SG_ABC -sid 085 -rdfg 16 -remote_sg remote_SG_ABC_HOP2 createpair -type R1 -est -hop2 -hop2_rdfg 6

---------------------------------------------------------
Sym                             Device                Cap
Dev     Pdev Name               Config     Sts       (MB)
---------------------------------------------------------
0009A   N/A                     RDF2+TDEV  RW        3278
0009B   N/A                     RDF2+TDEV  RW        4125

The devices at hop 1 that were R2 before the operation, are now R21 devices.