Hardware Failure
Description
Failure Behavior If
HACMP Is Not
Configured
Extra Work Required
To Provide Recovery
Action (in addition to
normal HACMP
configuration)
Recovery Action and Behavior If
HACMP Is Configured
Node Outage or AIX
crash
Node unavailable None HACMP fallover. Application(s)
unavailable for brief time during
fallover.
Ethernet adapter failure Access to node through
Ethernet lost, error log
entry.
None HACMP swap adapter event moves
IP address to spare adapter. Node
Ethernet IP address unavailable for
an extremely brief period as address
is swapped.
SSA Drawer Power
Supply Failure
None seen, error log
entry
None N/A (no fallover)
SSA adapter failure¹ None seen, error log
entry
None N/A (no fallover)
CPU power supply or
cooling subsystem
failure
Node available, N+1
redundancy
None N/A (no fallover)
CPU power cord or
power supply circuit
failure
Node unavailable None HACMP fallover, application(s)
unavailable for a brief time during
fallover.
I/O drawer power supply
or cooling subsystem
failure
Node available, N+1
redundancy
None N/A (no fallover)
I/O drawer power cord
failure
Fallover does not
happen if the redundant
power supplies are
cabled to separate I/O
rack power distribution
units that are powered
by different supply
circuits.
None N/A (no fallover).
I/O power distribution
unit power cord failure.
None None N/A (no fallover).
¹ Assumes “Quorum off” for volume group.
High Availability Cluster Server System Cabling
This section provides cabling information for the base HA cluster server. Ensure that the two systems are
installed before cabling the HA cluster server. Consider the following cable areas to ensure the redundancy
required for no single points of failure:
v Cabling for server system consoles and cluster administration workstations
v Heartbeat connections between HA cluster servers
v SSA cable connections between HA cluster servers and 7133 Serial Disk Subsystems
v Power cable connections
Cabling For System Consoles and Cluster Administration Workstations
The system console for a High Availability Cluster Server can be either of the following:
v an ASCII terminal connection to the S1 serial port
368 Site and Hardware Planning Information
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