Update Information Management of REC

A separate copy control bitmap is required for REC in both (source and destination) ETERNUS DX storage systems to manage and control update information.

The update information during the suspended state is managed only within each ETERNUS DX and during the resumed state, the update information in both ETERNUS DX storage systems is merged and only the areas where the data in the copy source and copy destination differs are copied.

Figure: Update Information Management between ETERNUS DX Storage Systems