HP Integrity NonStop H-Series - Manual (Page 10)

Figure 1 Architecture of NSMQ
N
onS
top Cl
uster I/O Protoco
ls
tc
p://<
Hostname IP Address>:<Po
rt N
o.>
SQL/MX Database
Producer
Consumer
Bn
B1
B3
B2
Bn B1 : Brokers ......
SQL/MX database:
SQL/MX database is used as a data store for storing messages. The brokers connect to the database
to store and retrieve messages.
Cluster:
The cluster is made up of network of brokers and is used for handling additional load.
All the brokers are connected to each other using a duplex network connector to exchange
information and states of each broker. These brokers listen on a local loopback address with
different port numbers and are used exclusively for clustering.
In such a cluster, all the messages are accessible to all the brokers. A new broker can be introduced
by adding the broker to the local grid without disturbing the existing cluster, thus achieving scalability
(page 11) .
Every broker is a combination of master and slave broker and is configured to run as two TS/MP
server classes — one process each for a master instance and a slave instance. The master instance
10 Introduction to NSMQ