Figure 1 shows how disaster recovery proceeds with remote copy solutions.
Comparing Figure 1 with Figure 1, you find that remote copy improves the current disaster recovery process by allowing a much shorter recovery time with little or no data loss. Remote copy promotes faster recovery because it constantly updates the records at the recovery site to match the primary application records. In the event of a disaster, remote copy minimizes or even eliminates data loss.
Figure 1. Disaster recovery scenario with remote copy. Remote copy allows recovery to take place faster and more completely.
The remote copy XRC and PPRC options maintain current copies of
your vital data as follows:
- With synchronous PPRC, a minimal amount of data might be lost between the last update at the primary system and the recovery at the recovery system site.
- With PPRC extended distance, data updates might be lost since the last complete copy cycle; because updates are not copied in order, the contents of the secondary volume are unpredictable.
- With XRC, the only data that is lost is data that is in transit between the time that the primary system fails and the recovery at the recovery system site occurs.
For additional information about PPRC, refer to Managing Peer-to-Peer Remote Copy operations.