Shadow Servers - HP Reliable Transaction Router Getting Started

RTR Server Types
Transactional shadowing is done by partition. A transactional
shadow configuration can have only two members of the shadow
set.
Shadow servers are servers on separate backends that handle
the same transactions in parallel on identical copies of the
database.
Figure 1–15 shows a simple shadow configuration. The main
backend server application at Site 1 and the shadow server
(Shadow application) at Site 2 both receive every transaction
for the data partition they are servicing. Should Site 1 fail,
Site 2 continues to operate without interruption. Sites can
be geographically remote, for example, available at separate
locations in a wide area network (WAN).
Figure 1–15 Shadow Servers
1–20 Introduction
FE
Client
application
FE
Client
application
FE
Client
application
Terminals Frontends
Site 1
BE
Server
application
TR
Site 2
BE
Shadow
application
Router Backends
Database
VM-0834A-AI