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Oracle Solaris Cluster Geographic Edition Data Replication Guide for EMC Symmetrix Remote Data Facility |
1. Replicating Data With EMC Symmetrix Remote Data Facility Software
2. Administering SRDF Protection Groups
Strategies for Creating SRDF Protection Groups
Creating a Protection Group While the Application Is Offline
Creating a Protection Group While the Application Is Online
Creating, Modifying, Validating, and Deleting an SRDF Protection Group
How to Create and Configure an SRDF Protection Group
Requirements to Support Oracle Real Application Clusters With Data Replication Software
How to Create a Protection Group for Oracle Real Application Clusters
How the Data Replication Subsystem Validates the Device Group
How to Modify an SRDF Protection Group
Validating an SRDF Protection Group
How to Validate an SRDF Protection Group
How to Delete an SRDF Protection Group
Administering SRDF Application Resource Groups
How to Add an Application Resource Group to an SRDF Protection Group
How to Delete an Application Resource Group From an SRDF Protection Group
Administering SRDF Data Replication Device Groups
How to Add a Data Replication Device Group to an SRDF Protection Group
Validations Made by the Data Replication Subsystem
How the State of the SRDF Device Group Is Validated
Determining the State of an Individual SRDF Device Group
Determining the Aggregate SRDF Device Group State
Determining the SRDF Pair State
How to Modify an SRDF Data Replication Device Group
How to Delete a Data Replication Device Group From an SRDF Protection Group
Replicating the SRDF Protection Group Configuration to a Partner Cluster
How to Replicate the SRDF Protection Group Configuration to a Partner Cluster
Deactivating an SRDF Protection Group
How to Deactivate an SRDF Protection Group
Resynchronizing an SRDF Protection Group
How to Resynchronize a Protection Group
Checking the Runtime Status of SRDF Data Replication
Displaying an SRDF Runtime Status Overview
How to Check the Overall Runtime Status of Replication
Displaying a Detailed SRDF Runtime Status
3. Migrating Services That Use SRDF Data Replication
When you activate a protection group, the protection group assumes the role that you assigned to it during configuration. You can activate a protection group in the following ways:
Globally – Activates a protection group on both clusters where the protection group is configured
On the primary cluster only – Secondary cluster remains inactive
On the secondary cluster only – Primary cluster remains inactive
Activating an SRDF protection group on a cluster has the following effect on the data replication layer:
The data replication configuration of the protection group is validated. During validation, the current local role of a protection group is compared with the configuration of the SRDF device groups.
If the SRDF device group is not in a Failedover state, the local role of the protection group should match the role of the SRDF device group.
If the SRDF device group is in a Failedover state, then the local role of the protection group becomes secondary while the role of the SRDF device group remains primary.
Data replication is started on the data replication device groups that are configured for the protection group, no matter whether the activation occurs on a primary or secondary cluster. Data is always replicated from the cluster on which the local role of the protection group is primary to the cluster on which the local role of the protection group is secondary.
Application handling proceeds only after data replication has been started successfully.
Activating a protection group has the following effect on the application layer:
When a protection group is activated on the primary cluster, the application resource groups that are configured for the protection group are also started. The Geographic Edition software uses the following Oracle Solaris Cluster commands on the primary cluster to bring the resource groups online:
# scswitch -Z -g rglist
When a protection group is activated on the secondary cluster, the application resource groups are not started. The resource groups are put into the unmanaged state.
When you activate a protection group using the command in this procedure, application resource groups in the protection group are also brought online. For details about how the -e (scope) option affects resource groups in the protection group, see the geopg(1M) man page.
You must be assigned the Geo Management RBAC rights profile to complete this procedure. For more information about RBAC, see Geographic Edition Software and RBAC in Oracle Solaris Cluster Geographic Edition System Administration Guide.
# geopg start -e scope [-n] protectiongroupname
Specifies the scope of the command.
If the scope is local, then the command operates on the local cluster only. If the scope is global, the command operates on both clusters that deploy the protection group.
Note - The property values global and local are not case sensitive.
Prevents the start of data replication at protection group startup.
If you omit this option, the data replication subsystem starts at the same time as the protection group.
Specifies the name of the protection group.
The geopg start command uses the scswitch -Z -g resourcegrouplist command to bring resource groups and resources online. For more information about using this command, see the scswitch(1M) man page.
Example 2-14 How the Geographic Edition Software Issues the Command to Start Replication
In this example, the Geographic Edition software starts data replication of an SRDFdevice group.
First, the SRDF protection group is created.
phys-paris-1# geopg create -s paris-newyork-ps -o primary -d srdf srdfpg
The device group devgroup1 is added to the protection group.
phys-paris-1# geopg add-device-group devgroup1 srdfpg
The current RDF pair state of an SRDF device group, devgroup1, is returned in the output of the symrdf query command as follows:
phys-paris-1# symrdf -g devgroup1 query Device Group (DG) Name : devgroup1 DG's Type : RDF1 DG's Symmetrix ID : 000187401215 Source (R1) View Target (R2) View MODES -------------------------------- ------------------------ ----- ------------ ST LI ST Standard A N A Logical T R1 Inv R2 Inv K T R1 Inv R2 Inv RDF Pair Device Dev E Tracks Tracks S Dev E Tracks Tracks MDA STATE -------------------------------- -- ------------------------ ----- ------------ DEV001 00E4 RW 0 36 NR 00E4 RW 36 0 S.. Split DEV002 00E5 RW 0 36 NR 00E5 RW 36 0 S.. Split DEV003 00E6 RW 0 36 NR 00E6 RW 36 0 S.. Split
The aggregate device group state is Split.
Next, the protection group, srdfpg, is activated by using the geopg start command.
phys-paris-1# geopg start -e local srdfpg
The Geographic Edition software runs the symrdf -g devgroup1 establish command at the data replication level. If the command is successful, the state of devgroup1 is returned in the output of the symrdf query command as follows:
phys-paris-1# symrdf -g devgroup1 query Device Group (DG) Name : devgroup1 DG's Type : RDF1 DG's Symmetrix ID : 000187401215 Source (R1) View Target (R2) View MODES -------------------------------- ------------------------ ----- ------------ ST LI ST Standard A N A Logical T R1 Inv R2 Inv K T R1 Inv R2 Inv RDF Pair Device Dev E Tracks Tracks S Dev E Tracks Tracks MDA STATE -------------------------------- -- ------------------------ ----- ------------ DEV001 00E4 RW 0 0 RW 00E4 WD 0 0 S.. Synchronized DEV002 00E5 RW 0 0 RW 00E5 WD 0 0 S.. Synchronized DEV003 00E6 RW 0 0 RW 00E6 WD 0 0 S.. Synchronized
Example 2-15 Activating an SRDF Protection Group Globally
This example activates a protection group globally.
# geopg start -e global srdfpg
The protection group, srdfpg, is activated on both clusters where the protection group is configured. The application resource groups in srdfpg are brought online on the primary cluster.
Example 2-16 Activating an SRDF Protection Group Locally
This example activates a protection group on a local cluster only. This local cluster might be a primary cluster or a secondary cluster, depending on the role of the cluster.
# geopg start -e local srdfpg
If the local cluster is the primary cluster, the resource groups in srdfpg also brought online on that cluster.