Appendix G High AvailabilityHPSS Installation Guide September 2002 545Release 4.5, Revision 2HPSS 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 PreparationG.3.1 Physically set up your system and install AIXThe first step to prepare a system for HA HPSS is to perform the physical setup. This includes allthe physical cabling for power, networks, disk devices, etc. We will not go into detail on how toaccomplish this as most of this procedure is routine. However, be sure to follow the guidelinesbelow 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 diskdrawer that attaches to the SCSI adapter in slot X of node 1 also attaches to the same porton the SCSI adapter in slot X of node 2. This will ensure that hdiskYY on node 1 is the samephysical disk as hdiskYY on node 2.• Route power cables such that the dual power supplies for each node and disk drawer aresupplied from a different power distribution strip.• Use only the ethernet adapters in the PCI slots, do not use the ethernet cards that areintegrated into the motherboards. (This is because any ethernet adapter may fail, andreplacing 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 rootvgMirror rootvg on each machine. Before this step, your rootvg should contain only one disk (we’llassume hdisk0), and you should have another internal disk available (we’ll assume hdisk1). It ispreferable to have each disk on a different internal bus:% extendvg rootvg hdisk1% mirrorvg -m rootvg hdisk1% bosboot -a
