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each Memory Channel adapter on one system must be connected to the
same linecard in each Memory Channel hub.
2.3 Host Bus Adapter Restrictions
To connect a member system to a shared SCSI bus, you must install a host
bus adapter in an I/O bus slot.
The Tru64 UNIX operating system supports a maximum of 64 I/O buses.
TruCluster Server supports a total of 32 shared I/O buses using KZPSA-BB
host bus adapters, KZPBA-CB UltraSCSI host bus adapters, or KGPSA
Fibre Channel host bus adapters.
The following sections describe the host bus adapter restrictions in more
detail.
2.3.1 Fibre Channel Requirements and Restrictions
The following requirements and restrictions apply to the use of Fibre
Channel with TruCluster Server Version 5.1:
• The HSG60 and HSG80 require Array Control Software (ACS) Version
8.5 or later.
• Eight member systems may be connected to common storage over Fibre
Channel in a fabric (switch) configuration.
• The Fibre Channel RAID Array 8000 (RA8000) midrange departmental
storage subsystem and Fibre Channel Enterprise Storage Array 12000
(ESA12000) house two HSG80 dual-channel controllers. There are
provisions for six UltraSCSI channels. A maximum of 72 disks is
supported.
• The StorageWorks Modular Array 6000 (MA6000) is built with the new
StorageWorks packaging, which consists of:
– A Compaq StorageWorks enclosure Model 2100, which houses
dual-redundant HSG60 controllers.
– The 14-bay drive shelves (Compaq StorageWorks enclosure Model
4200).
The Model 2100 enclosure with HSG60 controllers supports two SCSI
buses, which may be:
– Two drive shelves (Model 4214R) with up to 12 disk drives each. The
drive shelves use single-bus mode (one SCSI bus per drive shelf).
– One drive shelf (Model 4254) with up to 14 disk drives. The drive
shelf uses dual-bus mode (two SCSI buses, each with 7 disk drives).
Hardware Requirements and Restrictions 2–5