Bull Escala EPC1200, Руководство по подключению, Страница: 26 / 224

5-4
EPC Connecting Guide
Serial Networks
There are two type of serial networks:
A first one is used by HACMP to monitor the nodes. Nodes periodically exchange keep
alive messages (heart beat) in particular through this network.
A second one is used to wire the nodes on a console concentrator, if any. It enables a
single terminal connected to the console concentrator to be the system console of every
node.
A node provides 2 or 3 native serial ports:
S1 (or COM1) port is used to connect a system console.
S2 (or COM2) is dedicated to remote maintenance (EPC440, 800, 1200 and 2400).
S3 (or COM3) is a third serial port available on EPC400, 430 and EPC800 models.
When more serial ports are necessary, one can use a multi–port Asynchronous board. EPC
models are provided per default with an 8–port async card. For remote maintenance
purposes, in the case of a configuration with a cluster console, an 8–port async card is
necessary on the node to which the modem is connected.
Heart Beat Network
A serial ring is established between all the nodes.
For a 2–node configuration, there is a serial cable between node #1 and node #2. The cable
is connected to a serial port on each node. Either S3 port or a port on the multi–port async
board is used. (In the case of RL470, EPC440, 1200, 2400, it is the 8–port board since
there is no S3 port).
For disaster recovery configuration the serial line can be extended by using a micro-modem
at each line end. No lines, nor micro-modems can be ordered and thereby are not provided
by the manufacturing.
For configuration with N nodes (N>2) , there is a serial cable between:
node #1 and node #2
node #2 and node #3
...
node #N and node #1.
Two serial ports are used on each node. They are either two ports of the multiple–port
async board (mandatory on EPC1200 systems), or the native serial ports S2 (COM2) and
S3 (COM3).
Notes:
1. Using S2 port may be in conflict with remote maintenance access needs
(EPC800).
2. On EPC1200 and EPC2400 systems, the multi–port async card should be put
into slot 5 or slot 7.
3. On EPC400 and EPC430 nodes, COM2 and COM3 serial ports must be used.
You must not use COM1 port of multiple–port async board.
4. On EPC440, COM2 can be used.
Console Network
When there is a console concentrator, each node is linked to the console concentrator with
a serial cable. The cable is connected to the S1 (COM1) serial port of the node.