Appendix I. High-Availability Cabling
HA - S80 or S85 Advanced Cluster Servers consist of a minimum of two systems in a
cluster with two 7133 SSA Disk Storage Systems. Each system in the cluster requires
the AIX operating system software and HACMP high-availability cluster software. The
base systems use and share the external SSA disks in the 7133 SSA Disk Storage
Systems.
Each system in a cluster has a minimum of two SSA PCI adapters to allow redundant
connection to the 7133 SSA Disk Storage Systems.
It is highly recommended that a 3153 ASCII terminal (or equivalent) be purchased even
if graphics adapters or remote workstations are used as the control console. This allows
a service representative to work on one of the cluster servers through the serial port
without affecting the other server. If a graphical display is preferred to the 3153 display,
a low-cost workstation can be connected through an Ethernet connection or a local
network.
The 7133 Serial Disk Storage System is shipped with eight 9.1 GB SSA disk drives on
two loops and a redundant AC power supply
Up to four SSA adapters can be put in each cluster server. The base cluster server
systems offer configuration flexibility. Because cluster servers are comprised of systems
that can operate independently, all normally available features are supported.
Configuring the HA - S80 or S85 Advanced Cluster Server System With No
Single Points of Failure
Redundant adapters and mirrored disks are the only way to guarantee redundancy in
the 7133 serial disk system. In this configuration, no single hardware component failure
can cause the serial disk system to be unavailable.
Refer to the High Availability Cluster Multi-Processing for AIX, Version 4.3: Enhanced
Scalability Installation and Administration Guide, SC23-4284, and the High Availability
Cluster Multi-Processing for AIX, Version 4.3: Planning Guide , SC23-4277, for
HACMP/ES planning information.
The following table describes outages and their impacts for the minimum cluster server
configuration with mirrored SSA adapters (2 Ethernets, 2 SSA adapters, mirrored disk,
HACMP, external SSA and two power distribution units (PDUs) per I/O rack).
© Copyright IBM Corp. 1999, 2000 649
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