Technical data

3.6.1.3 Installing the DS-DWZZH-05 UltraSCSI Hub
To install the DS-DWZZH-05 UltraSCSI hub, follow these steps:
1. Remove the W1 jumper to enable wide addressing mode. (See
Figure 3–3.)
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, service
failover through the cluster application availability (CAA) subsystem,
disk mirroring, and fast file system recovery. TruCluster Server supports
mirroring of the member-specific boot disks and the cluster quorum disk
through hardware RAID only. You can mirror the clusterwide root (/),
/usr and /var file systems, the data disks, and the swap disk 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.
To determine the supported storage shelves, disk devices, and RAID
array controllers, see the AlphaServer options list for your system at the
following URL: http://www.compaq.com/alphaserver/products/op-
tions.html
Disk devices that are 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
3–16 Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware