IBM TotalStorage DS6000 Series - Manual (Page 127)

Chapter 6. Copy Services 103
Figure 6-11 z/OS Global Mirror (DS6000 is used as secondary system)
6.2.4 Comparison of the Remote Mirror and Copy functions
In this section we summarize the use of and considerations for Remote Mirror and Copy
functions.
Metro Mirror (Synchronous PPRC)
Description
Metro Mirror is a function for synchronous data copy at a distance.
Advantages
There is no data loss and it allows for rapid recovery for distances up to 300 km.
Considerations
There may be slight performance impact for write operations.
2
1
Server write
Write acknowledge
Write
ashynchronously
Primary server
System
Data
Mover
Secondary server
System Data Mover is
managing data consistency
DS8000 or ESS
DS6000