The
system provides Copy Services functions that can be used to improve
availability and support disaster recovery.
- FlashCopy function
- Makes an instant, point-in-time
copy from a source volume to a target volume.
- Creates either point-in-time copies on
a system, or a point-in-time data copy on another system.
- 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 performed.
- 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 environments that have less bandwidth
available between the sites than that update rate of the replicated
workload.
- HyperSwap function
- 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.
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: