test

Sun Cluster Geographic Edition Data Replication Guide for EMC Symmetrix Remote Data Facility

How the State of the EMC Symmetrix Remote Data Facility Device Group Is Validated

The state of each EMC Symmetrix Remote Data Facility device group is mapped to the Sun Cluster Geographic Edition resource group state. The symrdf -g dgname query command returns this state.

The remainder of this section describes the individual device group states and how these states are validated against the local role of the protection group.

Determining the State of an Individual EMC Symmetrix Remote Data Facility Device Group

An individual EMC Symmetrix Remote Data Facility device group can be in one of the following states:

Determining the Aggregate EMC Symmetrix Remote Data Facility Device Group State

If a protection group contains only one EMC Symmetrix Remote Data Facility device group, then the aggregate device group state is the same as the individual device group state.

When a protection group contains multiple EMC Symmetrix Remote Data Facility device groups, the aggregate device group state is obtained as described in the following table.

Table 2–1 Conditions That Determine the Aggregate Device Group State

Condition 

Aggregate Device Group State 

Any of the individual device group states are Invalid.

Invalid

Any of the individual device groups states are Partitioned and none of the individual device group states is Invalid.

Partitioned

One or more of the individual device groups states are Suspended and none of the individual device group states is Invalid, or Partitioned.

Suspended

One or more of the individual device groups states are Split and none of the individual device group states is Invalid, Partitioned, or Suspended.

Split

One or more of the individual device groups states are R1 UpdInProg and none of the individual device group states is Invalid, Partitioned, Suspended, or Split.

R1 UpdInProg

One or more of the individual device groups states are R1 Updated and none of the individual device group states is Invalid, Partitioned, Suspended, Split, or R1 UpdInProg.

R1 Updated

One or more of the individual device groups states are Failedover and none of the individual device group states is Invalid, Partitioned, Suspended, Split, R1 UpdInProg, or R1 Updated.

Failedover

One or more of the individual device groups states are SynInProg and none of the individual device group states is Invalid, Partitioned, Suspended, Split, R1 UpdInProg, R1 Updated, or Failedover.

SynInProg

All of the individual device group states are Synchronized.

Synchronized

Determining the EMC Symmetrix Remote Data Facility Pair State

The resource status message reflects the role and state of the RDF pair. For example, the resource status and status message of Faulted Split, is reported when the RDF pair is in a Split state.

The RDF pair state is mapped to the associated resource status as described in the following table.

Table 2–2 Mapping From the RDF Pair State to the Resource Status

Condition 

Resource Status 

Status Message 

The RDF pair state is Invalid and the pair state is not Incorrect Role.

Faulted

Invalid state

The RDF pair state is Partitioned and the pair state is not Incorrect Role, or Invalid.

Faulted

Partitioned

The RDF pair state is Suspended and the pair state is not Incorrect Role, Invalid, or Partitioned.

Faulted

Suspended

The RDF pair state is SyncInProg and the pair state is not Incorrect Role, Invalid, Partitioned, or Suspended.

Degraded

SyncInProg

The RDF pair state is R1 UpdInProg and the pair state is not Incorrect Role, Invalid, Partitioned, Suspended, or SyncInProg.

Faulted

R1 UpdInProg

The RDF pair state is Split and the pair state is not Incorrect Role, Invalid, Partitioned, Suspended,SyncInProg, or R1 UpdInProg.

Faulted

Split

The RDF pair state is Failed over and the pair state is not Incorrect Role, Invalid, Partitioned, Suspended,SyncInProg, R1 UpdInProg, or Split.

Faulted

Failed over

The RDF pair state is R1 Updated and the pair state is not Incorrect Role, Invalid, Partitioned, Suspended,SyncInProg, R1 UpdInProg, Split, or Failed over.

Faulted

Replicating with role change

The RDF pair state is Synchronized.

Online

Replicating

The state of the RDF pair determines the availability of consistent data in the partnership. When the state of the RDF resource on the primary or secondary cluster is Degraded or Faulted, the data volumes might not be synchronized even if the application can still write data from the primary volume to the secondary volume. The RDF pair will be in a Partitioned state and the invalid entries will be logged as the data is written to the primary volume. Manual recovery operations are required to resolve the error and resynchronize the data.