IBM DS8000 User Manual
Page 152
130
DS8000 Series: Concepts and Architecture
Figure 7-12 z/OS Metro/Global Mirror
7.2.4 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.
Write
asynchronously
System
Data
Mover
Secondary server
System Data Mover is
managing data consistency
2
3
1
4
Server write
Write to secondary
Write acknowledge
Write hit
to secondary
Primary server
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