If GDS Snapshot is installed in a system where a disk array unit with the OPC or QuickOPC function is used, backup can be performed through instant snapshot by OPC using proxy volumes without stopping services.
However, to secure consistency of snapshot data, the services must be stopped temporarily when creating a snapshot (when updating proxy volumes).
See
For details on snapshots by OPC, see "1.5.3 Instant Snapshot by OPC."
For securing consistency of snapshot data, see "3.17 Ensuring Consistency of Snapshot Data."
Figure 7.56 Backup Schedule
Information
Background Copy (OPC Physical Copy) and Backup to Tape
During the copying process, data can be backed up to tape, but the backup will impose the load to the disk array unit and may affect services using master volumes.
Note
Instant Snapshot by OPC
For use conditions for instant snapshot by OPC, see "3.18 Instant Snapshot by OPC." If proxy volumes are in mirroring configuration with the multiplicity of two and higher, the OPC function is unavailable for copying data from master volumes to the proxy volumes. For details, see "A.8 Using Advanced Copy Function in Proxy Configuration."
Note
Instant Snapshot by OPC Use Conditions
See the following sections for points of concern.
