Technical data

non-UltraSCSI BA356, as shown in Figure 10–8. With proper lighting you
will be able to see a J or T near the hole where the pin sticks through.
Termination for both ends of the UltraSCSI BA356 internal, single-ended
bus is on the personality module, and is always active. Termination for
the differential UltraSCSI bus is also on the personality module, and
is controlled by the SCSI bus termination switches, switch pack S4.
DS-BA35X-DA termination is discussed in Section 10.1.2.2.
10.4 Preparing the Storage for Configurations Using
External Termination
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 file system 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.
Disk devices used on the shared bus must be located in a supported storage
shelf. 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.
The following sections describe how to prepare storage for a shared SCSI bus
and external termination for:
• A BA350, a BA356, and an UltraSCSI BA356
• Two BA356s
• Two UltraSCSI BA356s
• An HSZ20, HSZ40, or HSZ50 RAID array controller
• A RAID Array 3000 with HSZ22 controller
If you need to use a BA350 or non-UltraSCSI BA356 with an UltraSCSI
BA356 storage shelve, extrapolate the needed information from
Section 10.4.1 and Section 10.4.3.
Later sections describe how to install cables to configure an HSZ20, HSZ40,
or HSZ50 in a TruCluster Server configuration with two member systems.
10–14 Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices