This section describes cascade copy when using the Storage Cluster Continuous Copy function.
A cascade copy links the copy destination to the processing of another copy as a copy source. Refer to the ETERNUS Disk storage system manuals for details about the cascade copies.
Using cascade copy, it is possible to broaden application scenarios, such as backups that combine duplication to remote areas and sub-center side backups. When using the Storage Cluster Continuous Copy function, configuring cascade copies to different boxes as the backup target are supported. In this way, it can be operated as a secondary backup.
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Use QuickOPC for intra-box copy.
Use AdvancedCopy Manager Copy Control Module for REC. Refer to the AdvancedCopy Manager Operation Guide for Copy Control Module for details. Use Stack mode for the data transfer mode in REC.
Cascade copy (QuickOPC) can be performed with the REC target as the copy source.
Figure 7.16 Example of Backup/Restore Using Cascade Copy on Primary Storage
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Cascade copy can be performed from the Secondary Storage via REC.
When restoring, put the REC for the storage device where the TFO status is "Standby" into suspend state, and then perform REC.
Figure 7.17 Example of Backup/Restore Using Cascade Copy on Secondary Storage
