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Cluster Hardware and Software Preparation 65
3.2.2.4 Configuring Target Mode SSA
The node number on each system needs to be changed from the default of
zero to a number. All systems on the SSA loop must have a unique node
number.
To change the node number use the following command:
chdev -l ssar -a node_number=#
To show the system’s node number use the following command:
lsattr -El ssar
Having the node numbers set to non-zero values enables the target mode
devices to be configured. Run the
cfgmgr command to configure the tmssa#
devices on each system. Check that the tmssa devices are available on each
system using the following command:
lsdev -C | grep tmssa
The Target Mode SCSI or SSA serial network can now be configured into an
HACMP cluster.
3.2.2.5 Testing RS232 and Target Mode Networks
Testing of the serial networks functionality is similar. Basically you just write
to one side’s device and read from the other.
Serial (RS323): After configuring the serial adapter and cabling it correctly,
you can check the functionality of the connection by entering the command
cat < /dev/ttyx
on one node for reading from that device and
cat /etc/environment > /dev/ttyy
on the corresponding node for writing. You should see the first command
hanging until the second command is issued, and then showing the output of
it.
Target Mode SSA: After configuration of Target Mode SSA, you can check
the functionality of the connection by entering the command:
cat < /dev/tmssax.tm
on one node for reading from that device and: