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2. If fair arbitration is to be used, ensure that the switch on the front of
the DS-DWZZH-05 UltraSCSI hub is in the Fair position.
3. Install the DS-DWZZH-05 UltraSCSI hub in a UltraSCSI BA356,
non-UltraSCSI BA356 (if it has the required 180-watt power supply), or
BA370 storage shelf.
3.7 Preparing the UltraSCSI Storage Configuration
A TruCluster Server cluster provides you with high data availability through
the cluster file system (CFS), the device request dispatcher (DRD), service
failover through the cluster application availability (CAA) subsystem,
disk mirroring, and fast file system recovery. TruCluster Server supports
mirroring of the clusterwide root (/) file system, the member-specific boot
disks, and the cluster quorum disk through hardware RAID only. You can
mirror the clusterwide /usr and /var file systems and the data disks using
the Logical Storage Manager (LSM) technology. You must determine the
storage configuration that will meet your needs. Mirroring disks across two
shared buses provides the most highly available data.
See the TruCluster Server Software Product Description (SPD) to determine
the supported storage shelves, disk devices, and RAID array controllers.
Disk devices used on the shared bus must be installed in a supported storage
shelf or behind a RAID array controller. Before you connect a storage
shelf to a shared SCSI bus, you must install the disks in the unit. Before
connecting a RAID array controller to a shared SCSI bus, install the disks
and configure the storagesets. For detailed information about installation
and configuration, see your storage shelf (or RAID array controller)
documentation.
______________________ Note _______________________
The following sections mention only the KZPBA-CB UltraSCSI
host bus adapter because it is needed to obtain UltraSCSI speeds
for UltraSCSI configurations. The KZPSA-BB host bus adapter
may be used in any configuration in place of the KZPBA-CB
without any cable changes providing that it is supported on the
member system. Be aware though, the KZPSA-BB is not an
UltraSCSI device and therefore only works at fast-wide speed
(20 MB/sec).
The following sections describe how to prepare and install cables for storage
configurations on a shared SCSI bus using UltraSCSI hubs and the HSZ70
or HSZ80 RAID array controllers.
3–16 Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware