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The kernel requires unique numbers (starting at zero) to be assigned to each HBA controller that is to be used in a system. The boot controller must be assigned an HBA number of 0 for the system to boot up successfully. The HBA number for each controller must be known by the system administrator in order to locate the entries that are created for the attached devices under the /dev/ directory. Each device name begins with cC, where C is the HBA number. (The boot driver, for example, is named /dev/dsk/c0b0t0d0p0.) Compaq drivers follow the ``controller order'' specified during System Configuration: the controller selected as ``first'' will be HBA 0; the controller selected as ``second'' will be HBA 1. If System Configuration has not been used to assign a controller order to a Compaq HBA controller, then an HBA number may be selected by the driver. The driver will update the unit field in the resource manager database with the selected number. Assigning the numbers using System Configuration allows HBA numbers to be selected before the system is installed or has discovered the controller. For most other non-Compaq controllers, the HBA number will be assigned in the order the controller was discovered by the system. The HBA number of these controllers can be changed by editing the unit field of the resource manager using the dcu(ADM) command.
It is also possible for an application to access the SCSI bus subsystem directly by using the pass-through interface. See pt_open(S).
Some administrator tunable parameters that can be modified to affect the performance of the driver are contained in the file /etc/conf/pack.d/cpqsc/space.c.