Copy Services functions
The system provides Copy Services functions that can be used to improve availability and support disaster recovery.
The following Copy Services functions are available for all
supported hosts that are connected to the
system.
- Makes an instant, point-in-time copy from a source volume to a target volume.
- Provides a consistent copy of a source volume on a target volume. Data is written to the target volume synchronously after it is written to the source volume so that the copy is continuously updated.
- Provides a consistent copy of a source volume on a target volume. The data is written to the target volume asynchronously and the copy is continuously updated. However, the copy might not contain the most recent updates when a disaster recovery operation is completed.
- Enables support for Global Mirror with higher recovery point objective (RPO) by the use of change volumes. This function is for use in environments where the available bandwidth between the sites is smaller than the update rate of the replicated workload.
- Provides dual-site, active-active access to a volume. Data is written to the copies on both sites synchronously so that both copies are continuously updated and can be used immediately if one copy becomes unavailable.
Metro Mirror, Global Mirror, Global Mirror with change volumes, and HyperSwap functions are types of remote copy or remote replication.
If the system has a remote mirroring license and is configured correctly,
the following copy_type values can be specified in the CLI or management GUI
to create remote copy
relationships: