Compaq TruCluster Server AA-RHGWB-TE, Руководство пользователя

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BA356, as shown in Figure 9–8. 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 9.1.2.2.
9.4 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 (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.
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.
After completing the following sections and setting up your RAID
storagesets, you should be ready to cable your host bus adapters to storage
when they have been installed (see Chapter 10).
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
If you need to use a BA350 or non-UltraSCSI BA356 with an UltraSCSI
BA356 storage shelve, extrapolate the needed information from Section 9.4.1
and Section 9.4.2.
9–14 Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices