Tpc For Replication Terminology; Tpc For Replication Copy Set - IBM System storage DS6000 Series Redbook

31.5 TPC for Replication terminology

TPC for Replication manages and integrates not only the DS6000 and DS8000 but also the
SAN Volume Controller. In search of a common terminology and to describe the functions for
the different disk storage servers in a common way, new terms are introduced here that are
different from those normally used in the context of Copy Services with the ESS 800,
DS6000, and DS8000.

31.5.1 TPC for Replication Copy Set

A Copy Set in TPC for Replication is a set of volumes that have a copy of the same data. In
PPRC terms this is, for example, a PPRC primary volume and a PPRC secondary volume.
Figure 31-4 shows three Metro Mirror Copy pairs. In TPC for Replication each pair is
considered a Copy Set. A Copy Set here contains two volumes.
Local DS6000 / DS8000
Figure 31-4 TPC for Replication - Metro Mirror Copy Sets
Figure 31-5 on page 474 represents two Copy Sets. In this illustration, each Copy Set
contains three volumes, which indicates a Global Mirror configuration. Note that the third
volume is a kind of journal volume and is the FlashCopy target volume for data consistency in
a Global Mirror setup.
A
P3
Primary
Primary
Primary
A
P2
Primary
Primary
Primary
A
Primary
P1
Primary
Primary
Chapter 31. IBM TotalStorage Productivity Center for Replication
Remote DS6000 / DS8000
PPRC path
PPR link
PPRC path
PPR link
PPRC path
S3
Copy Set
Secondary
S2
Copy Set
Secondary
A
Primary
Primary
S1
Copy Set
Primary
Secondary
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