The system provides Copy Services
functions that can be used to improve availability and support disaster recovery. Some system models can require a separate license to
use these functions. Verify your licensing requirement before using these
functions.
The following Copy Services functions are available:
- IBM®
FlashCopy® function
- Makes an instant, point-in-time
copy from a source volume to a target volume.
- Metro Mirror
- 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.
- Global Mirror
- 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.
- Global Mirror with change volumes
- 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.
Metro Mirror, Global Mirror, Global Mirror
with change volumes, and HyperSwap® functions are
types of remote copy or remote replication.
If the system requires a remote mirroring license and it is configured correctly, the
following
copy_type values can be specified in the CLI or management GUI
to create remote copy relationships:
- activeactive
- global
- metro