IBM SG24-5131-00 Manuale Utente

HACMP Installation and Cluster Definition 

Adding or Changing Adapters after the Initial Configuration
If you want to change the information about an adapter after the initial 
configuration, use the Change/Show an Adapter screen. See the chapter on 
changing the cluster topology in the 

HACMP for AIX, Version 4.3: 

Administration Guide, SC23-4279, for more information.

Each supported cluster network in a configured HACMP cluster has a 
corresponding cluster network module. Each network module monitors all I/O 
to its cluster network. 

The Network Modules are pre-loaded when you install the HACMP software. 
You do not need to enter information in the Network Module SMIT screens 
unless you want to change some field associated with a network module, 
such as the failure detection rate.

Each network module maintains a connection to other network modules in the 
cluster. The Cluster Managers on cluster nodes send messages to each other 
through these connections. Each network module is responsible for 
maintaining a working set of service adapters and for verifying connectivity to 
cluster peers. The network module is also responsible for reporting when a 
given link actually fails. It does this by sending and receiving periodic 
heartbeat messages to or from other network modules in the cluster, and 
reporting back to the Cluster Manager when it misses a threshold number of 
heartbeats.

Currently, network modules support communication over the following types 
of networks:

  • Serial (RS232)
  • Target-mode SCSI
  • Target-mode SSA
  • IP (Generic IP)
  • Ethernet
  • Token-Ring
  • FDDI
    • SOCC

When IPAT is configured, the run level of the IP-related entries (e. g. 
rctcpip, rcnfs...) of the 

/etc/inittab

 are changed to “

a

”. This has the result 

that these services are not started at boot time, but with HACMP.