Configuring Metrocluster with EMC SRDF using SRDF/Asynchronous Multi-Session Consistency (MSC) Data Replication

The following sections describe the steps for building a composite group and package configuration in a SRDF/Asynchronous MSC environment. Following are the topics discussed in this chapter:

•Building a Composite Group for SRDF/Asynchronous MSC

•Configuring a package using SRDF/Asynchronous MSC

•Setting up the RDF Daemon

Building a Composite Group for SRDF/Asynchronous MSC

To perform an operation on a composite group for SRDF/Asynchronous MSC data replication, the composite group must be configured with devices that are SRDF/Asynchronous capable within the RDF group. Use the following steps to create a composite group.

1.List SRDF/Asynchronous capable devices on the source Symmetrix unit and be sure the SRDF/Asynchronous capable devices are mapped to RDF group for use For example, use the following command to display the devices from RDF (RA) group number 5:

# symrdf -sid symid list -rdfa -rdfg 5

Symmetrix ID: 000187400684 Local Device View

--------------------------------------------------------

STATUS MODES RDF S T

A T E

S

 

Sym

RDF ---------

----- R1

Inv R2 Inv ---------------------

Dev

RDev Typ:G SA RA

LNK MDA

Tracks Tracks Dev RDev Pair

---- ---- ------ --------- ----- ------- ------- ---

0196 0012 R1:5 RW RW RW S.. 0 0 RW WD Synchronized 0197 0013 R1:5 RW RW RW S.. 0 0 RW WD Synchronized 0198 0014 R1:5 RW RW RW S.. 0 0 RW WD Synchronized

2.Create a composite group for MSC. For example, the group name MSCcg. On R1 site, run the following command:

# symcg create MSCcg -type RDF1 –rdf_consistency

On R2 site, run the following command:

# symcg create MSCcg -type RDF2 –rdf_consistency

3.All devices from RDF (RA) groups configuration are added to the composite group for SRDF/Asynchronous MSC operation. For example, the RDF groups 6 and 7 are added to the composite group MSCcg for SRDF/Asynchronous MSC operation.

# symcg -cg MSCcg -rdfg 6 addall pd

# symcg -cg MSCcg –rdfg 7 addall pd

4.Repeat the steps 1-3 on each host that needs to run Serviceguard packages.

5.Query the composite group MSCcg to display the R1-to-R2 setup and the state of the SRDF/Asynchronous device pairs.

# symrdf -cg MSCcg query -rdfa

Following is a sample output of the command:

Source (R1) View

Target (R2) View

MODES

----------------------

---------------- ----- --------

 

ST

LI

ST

 

Standard

A

N

A

 

Logical

Sym

T

R1 Inv

R2 Inv

 

K

T

R1 Inv R2 Inv RDF Pair

Device

Dev

E

 

Tracks

Tracks

 

S Dev

 

E Tracks

Tracks

MDAC STATE

------------------------

 

 

 

--

------------------

 

 

-----

-------

-----

DEV001 0196

RW 0

0

RW 0012

WD 0 0

S...

Synchronized

 

 

DEV002 0197

RW 0

0

RW 0013

WD 0

0

S...

Synchronized

 

 

DEV003 0198

RW 0

0

RW 0014

WD 0

0

S...

Synchronized

 

 

Source (R1)

View

 

 

 

Target (R2)

View

MODES

 

-----------------------

 

 

 

------------------ ----- ----------

 

Metrocluster with SRDF/Asynchronous Multi-Session Consistency Data Replication 297