Technical data

behind an HSZ80, HSG60, or HSG80 controller. If the cluster member
is using earlier firmware, the member may fail to boot, indicating
"Reservation Conflict" errors.
• TruCluster Server Version 5.1A supports eight-member cluster
configurations as follows:
– Fibre Channel: Eight-member systems may be connected to common
storage over Fibre Channel in a fabric (switch) configuration.
– Parallel SCSI: Only four of the member systems may be connected to
any one SCSI bus, but you can have multiple SCSI buses connected
to different sets of nodes, and the sets of nodes may overlap. We
recommend you use a DS-DWZZH-05 UltraSCSI hub with fair
arbitration enabled when connecting four-member systems to a
common SCSI bus using RAID array controllers.
Illustrations of an externally terminated eight-node cluster are
shown in Chapter 11. The cluster shown is more appropriate for high
performance technical computing (HPTC) customers who are looking
for performance instead of availability.
• The following items pertain to the AlphaServer GS80/160/320 systems:
– High power peripheral component interconnect (PCI) modules
(approximately 25 watts or greater) must be placed in PCI slots with
a 1-inch module pitch; any slot except 0-5, 0-6, 1-5, and 1-6.
A primary or expansion PCI drawer contains two 3-slot PCI buses
and two 4-slot PCI buses (see Figure 2–1):
PCI0 for I/O riser 0: Slots 0-0/1, 0-2, and 0-3
PCI1 for I/O riser 0: Slots 0-4, 0-5, 0-6, and 0-7
PCI0 for I/O riser 1: Slots 1-1, 1-2, and 1-3
PCI1 for I/O riser 1: Slots 1-4, 1-5, 1-6, and 1-7
___________________ Note ___________________
Slot 0-0/1 in a primary PCI drawer contains the standard
I/O module.
2–2 Hardware Requirements and Restrictions