Compaq AA-RHGWC-TE manual Preparing the UltraSCSI Storage Configuration

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.

3.7Preparing 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.

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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.

3–16Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware