Compaq AA-RHGWB-TE manual

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.

9.4Preparing 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.

9–14Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices