Filter
Top Products
2.4 SCSI Bus Adapter Restrictions
To connect a member system to a shared SCSI bus, you must install a SCSI
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 SCSI adapter restrictions in more detail.
2.4.1 KZPSA-BB SCSI Adapter Restrictions
KZPSA-BB SCSI adapters have the following restrictions:
• The KZPSA-BB requires A12 firmware.
• If you have a KZPSA-BB adapter installed in an AlphaServer that
supports the bus_probe_algorithm console variable (for example, the
AlphaServer 800, 1000, 1000A, 2000, 2100, or 2100A systems support
the variable), you must set the bus_probe_algorithm console variable
to new by entering the following command:
>>> set bus_probe_algorithm new
Use the show bus_probe_algorithm console command to determine if
your system supports the variable. If the response is null or an error,
there is no support for the variable. If the response is anything other
than new, you must set it to new.
• On AlphaServer 1000A and 2100A systems, updating the firmware on
the KZPSA-BB SCSI adapter is not supported when the adapter is
behind the PCI-to-PCI bridge.
2.4.2 KZPBA-CB SCSI Bus Adapter Restrictions
KZPBA-CB UltraSCSI adapters have the following restrictions:
• Each system supporting the KZPBA-CB UltraSCSI host adapter limits
the number of adapters that may be installed. The maximum number of
KZPBA-CB UltraSCSI host adapters supported with TruCluster Server
follow:
– AlphaServer 800: 2
– AlphaServer 1000A and 1200: 4
– AlphaServer 4000: 8; only one KZPBA-CB is supported in IOD0
(PCI0).
– AlphaServer 4100: 5; only one KZPBA-CB is supported in IOD0
(PCI0).
2–6 Hardware Requirements and Restrictions