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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.
2.3.3 KZPBA-CB SCSI Bus Adapter Restrictions
KZPBA-CB UltraSCSI adapters have the following restrictions:
• A maximum of four HSZ50, HSZ70, or HSZ80 RAID array controllers can
be placed on a single KZPBA-CB UltraSCSI bus. Only two redundant
pairs of array controllers are allowed on one SCSI bus.
• The KZPBA-CB requires ISP 1020/1040 firmware Version 5.57 (or
higher), which is available with the system SRM console firmware on the
Alpha Systems Firmware 5.3 Update CD-ROM (or later).
• The maximum length of any differential SCSI bus segment is 25 meters,
including the length of the SCSI bus cables and SCSI bus internal to the
SCSI adapter, hub, or storage device. A SCSI bus may have more than
one SCSI bus segment (see Section 3.1).
• See the KZPBA-CB UltraSCSI Storage Adapter Module
Release Notes
(AA-R5XWD-TE) for more information.
2.4 Disk Device Restrictions
The restrictions for disk devices are as follows:
• Disks on shared SCSI buses must be installed in external storage shelves
or behind a RAID array controller.
• TruCluster Server does not support Prestoserve on any shared disk.
2.5 RAID Array Controller Restrictions
RAID array controllers provide high performance, high availability, and high
connectivity access to SCSI devices through a shared SCSI bus.
Hardware Requirements and Restrictions 2–9