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Appendix G High Availability
HPSS Installation Guide September 2002 545
Release 4.5, Revision 2
HPSS Resource Group:
Resource Group Name _HPSSResourceGroup_
Resource Group Type _Rotating__
Application Server Name _HPSSAppServer_
Start Command _/var/hahpss/hpss_start.ksh_
Stop Command _/var/hahpss/hpss_stop.ksh_
G.3 System Preparation
G.3.1 Physically set up your system and install AIX
The first step to prepare a system for HA HPSS is to perform the physical setup. This includes all
the physical cabling for power, networks, disk devices, etc. We will not go into detail on how to
accomplish this as most of this procedure is routine. However, be sure to follow the guidelines
below to ensure that the resulting system is capable of serving as a highly available system.
• Keep the shared disks on separate busses
• Cable each disk bus on each node to a separate SCSI adapter, and make sure that the disk
drawer that attaches to the SCSI adapter in slot X of node 1 also attaches to the same port
on the SCSI adapter in slot X of node 2. This will ensure that hdiskYY on node 1 is the same
physical disk as hdiskYY on node 2.
• Route power cables such that the dual power supplies for each node and disk drawer are
supplied from a different power distribution strip.
• Use only the ethernet adapters in the PCI slots, do not use the ethernet cards that are
integrated into the motherboards. (This is because any ethernet adapter may fail, and
replacing the integrated adapter would involve replacing the motherboard).
• Don’t forget to connect your serial (null-modem) cable. Be sure to use it to connect like-
named serial ports on both machines. For example, S1-S1 or S2-S2.
• Be as symmetric as possible (make connections exactly the same way on both nodes).
G.3.2 Mirror rootvg
Mirror rootvg on each machine. Before this step, your rootvg should contain only one disk (we’ll
assume hdisk0), and you should have another internal disk available (we’ll assume hdisk1). It is
preferable to have each disk on a different internal bus:
% extendvg rootvg hdisk1
% mirrorvg -m rootvg hdisk1
% bosboot -a