9.5. Shared-Bus Access to Disks

The use of SCSI buses or Fibre Channel allows for configuration of data storage with access by more than one system at a time. The type and number of buses used, particularly in mirrored configurations, can affect performance considerably.

9.5.1. Single-Initiator Configurations

A single-initiator configuration is one in which a single SPU initiates access to a disk. An example is shown in Figure 9-9. This figure shows two configurations. At the top is a configuration with disks for two applications attached to the same SCSI bus, and the mirrors on a separate bus for high availability. At the bottom is a better performing configuration, in which the disks for the different applications are separated from each other. ...

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