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Cluster Hardware and Software Preparation 63
• Scan the /tmp/hacmp.out file to confirm that the /etc/rc.net script has run
successfully. Look for a zero exit status.
• If IP address takeover is enabled, confirm that the /etc/rc.net script has
run and that the service adapter is on its service address and not on its
boot address.
• Use the
lssrc -g tcpip command to make sure that the inetd daemon is
running.
• Use the
lssrc -g portmap command to make sure that the portmapper
daemon is running.
• Use the
arp command to make sure that the cluster nodes are not using
the same IP or hardware address.
3.2.2 Non TCP/IP Networks
Currently three types of non-TCP/IP networks are supported:
• Serial (RS232)
• Target-mode SCSI
• Target-mode SSA
While we use the word serial here to refer to RS232 only, in HACMP
definitions, a “serial” network means a non-TCP/IP network of any kind.
Therefore, when we are talking about HACMP network definitions, a serial
network could also be a target-mode SCSI or target-mode SSA network.
The following describes some cabling issues on each type of non-TCP/IP
network, how they are to be configured, and how you can test if they are
operational.
3.2.2.1 Cabling Considerations
RS232 Cabling a serial connection requires a null-modem cable. As often
cluster nodes are further apart than 60 m (181 ft.), sometimes
modem eliminators or converters to fiber channel are used.
TMSCSI If your cluster uses SCSI disks as shared devices, you can use
that line for TMSCSI as well. TMSCSI requires Differential SCSI
adapters (see Chapter 2.3.2.3, “Supported SCSI Adapters” on
page 26). Because the SCSI bus has to be terminated on both
ends, and not anywhere else in between, resistors on the
adapters should be removed, and cabling should be done as
shown in Figure 11 on page 77, that is, with Y-cables that are
terminated at one end connected to the adapters where the other
end connects to the shared disk device.