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 EMC Symmetrix Remote Data Facility 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 EMC Symmetrix Remote Data Facility device groups.
If the EMC Symmetrix Remote Data Facility device group is not in a Failedover state, the local role of the protection group should match the role of the EMC Symmetrix Remote Data Facility device group.
If the EMC Symmetrix Remote Data Facility device group is in a Failedover state, then the local role of the protection group becomes secondary while the role of the EMC Symmetrix Remote Data Facility 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. Use the following Sun Cluster command 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.
Log in to a cluster node.
You must be assigned the Geo Management RBAC rights profile to complete this procedure. For more information about RBAC, see Sun Cluster Geographic Edition Software and RBAC in Sun Cluster Geographic Edition System Administration Guide.
Activate the protection group.
When you activate a protection group, its application resource groups are also brought online.
# 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.
The property values, such as 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.
This example illustrates how the Sun Cluster Geographic Edition software determines the EMC Symmetrix Remote Data Facility command that is used to start data replication.
First, the EMC Symmetrix Remote Data Facility protection group is created.
phys-paris-1# geopg create -s paris-newyork-ps -o primary -d srdf srdfpg |
The device groupdevgroup1is added to the protection group.
phys-paris-1# geopg add-device-group devgroup1 srdfpg |
The current RDF pair state of an EMC Symmetrix Remote Data Facility 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 Sun Cluster 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 DEV004 00E7 RW 0 0 RW 00E7 WD 0 0 S.. Synchronized DEV005 00E8 RW 0 0 RW 00E8 WD 0 0 S.. Synchronized DEV006 00E9 RW 0 0 RW 00E9 WD 0 0 S.. Synchronized |
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.
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 |