mcis(7) —
NAME
mcis − low-level SCSI host bus adapter module
DESCRIPTION
The mcis module provides low-level interface routines between the High Performance Device Driver (see hpdd(7)) and the IBM PS/2 Micro Channel SCSI Host Adapters. This module was also written to interface with the generic SCSI module which provides common SCSI interface support to any host bus adapter modules.
It can be configured for disk or streaming tape support for one or more host adapter boards, each of which must be the sole initiator on a SCSI bus. The low-level code determines if the adapter is, in fact, present at the configured address (see disk(7) and tape(7)) and what types of devices are attached to it. It handles simultaneous requests for up to 15 devices at any one time.
For information on configuring a kernel to include the mcis module, refer to the INTERACTIVE UNIX System Installation and Maintenance Guide.
Board Configuration
The default configurations described in IBM Personal System/2 Micro Channel SCSI Host Adapters should be used for standard configurations of the system. If more than one host adapter is to be installed in any system, each must be set at a different set of I/O address ranges. Use of a different interrupt level for each board is encouraged, although not required.
Disk Configuration
The HPDD defines SCSI disk target 0 and logical unit number (LUN) 0 on the boot controller to be the boot disk. However, IBM established the convention that the highest SCSI device ID found would be the boot disk, as documented in IBM SCSI − Architecture and Implementation. Since target 7 is usually reserved for the adapter, this means that any disk configured as target 6, LUN 0 will become the bootable drive for the machine. In order to maintain both the notion of ease of installation and the same HPDD convention on the bootable device, mcis will automatically remap the disk with the highest SCSI ID, i.e., target 6 and LUN 0, in the above example, to target 0 and LUN 0.
SEE ALSO
disk(7), hpdd(7), mcesdi(7), mcst(7), tape(7). INTERACTIVE UNIX System Installation and Maintenance Guide.
ADDED VALUE
This entry, supplied by SunSoft, Inc., is an extension of UNIX System V.
\*U — Version 1.0