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manual abstract
The “DR Mode” is used to identify the configuration of the current environment:
• If the DR mode is “Source”, the current environment is Configuration I - Local Business Copy.
In this case, proceed to Step 3: Modifying or Removing the CA Link.
• If the DR mode is “Destination”, the current configuration is Configuration II - Remote Business
Copy. In this case, proceed to Step 2: Performing Failover.
Note:
Complex environments may include a mixture of Configuration I and
Configuration II. In this scenario, Business Copies exist that are both local
and remote when compared to the source storage volumes. To handle this,
perform the actions stated in Step 2: Performing Failover only to the DR
groups with the “Destination” DR mode.
Step 2: Performing Failover
Using the gathered information regarding DR groups, perform failover as appropriate for the
environment. For simple environments, this may include interactions with CV EVA or CA GUI, as well
as some configuration steps on the application system. Refer to the appropriate documentation for full
understanding before taking such actions.
For more complex environments, including clusters or other high-availability solutions, refer to the
respective documentation for that solution before performing any failover actions.
After the failover has been performed, proceed to Step 3: Modifying or Removing the CA Link.
Step 3: Modifying or Removing the CA Link
Modify the environment so that the source vDisks no longer participate in a DR group. This may be
accomplished in either of two methods:
1) Reducing the DR group by removing each source vDisk: this may be done if there is a more
complex environment and persisting the DR groups would ease reconfiguration of the
environment.
2) Deleting the DR group completely: this may be done if the CA links are no longer needed or
are easily reconfigurable.
Note
Before taking any actions, record the information pertaining to the DR
groups. This includes such things as the vDisks participating in the DR
group, which EVA arrays are being replicated to, the mode of operation,
and other specific details.
Refer to the CV EVA user documentation or other specific documentation for the detailed process for
either of these two methods.
In the case of a DR group reduction, there may only be source storage volumes inside the DR group.
A DR group must always have at least one vDisk participating. In this case, it is advisable to create a
temporary vDisk and add it to the DR group. With this temporary storage volume, all source storage
volumes may be removed from the DR group, and the DR group will still persist.
When this has been completed, proceed to Step 4: Performing Instant Recovery.
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