The Linux 2.4 SCSI subsystem HOWTO

Douglas Gilbert

      dgilbert@interlog.com
     

2002-01-26

Revision History
Revision 1.6 2002-01-26 Revised by: dpg
ATAPI cdrom selection
Revision 1.5 2001-12-21 Revised by: dpg
16 byte SCSI commands, SCSI_IOCTL_GET_PCI
Revision 1.4 2001-08-26 Revised by: dpg
spelling, dd_rescue, mkinitrd example, lk 2.4 changes, 1394.
Revision 1.3 2001-08-26 Revised by: dpg
ATAPI CDROM section, alter title, U320, iSCSI.
Revision 1.2 2001-03-25 Revised by: dpg
Information about scu, dt, "Alt" sequences, more notes.
Revision 1.1 2001-01-22 Revised by: dpg
Add osst description, _EXTRA_DEVS limitations.

This document describes the SCSI subsystem as the Linux kernel enters the 2.4 production series. An external view of the SCSI subsystem is the main theme. Material is included to help the system administration of the Linux SCSI subsystem. There are also brief descriptions of ioctl()s and interfaces that may be relevant to those writing applications that use this subsystem.


Table of Contents
1. Introduction
2. Architectural Overview
3. Names and Addresses
3.1. SCSI Addressing
3.2. Device Names
3.3. Device Names in devfs
3.4. Device Names in scsidev
4. Kernel Configuration
5. Boot Parameters
6. Modules and their Parameters
7. Proc pseudo file system
8. Mid Level, Unifying layer
8.1. boot parameters
8.2. module parameters
8.3. proc interface
9. Upper level drivers
9.1. Disk driver (sd)
9.2. CDROM driver (sr or scd)
9.3. Tape driver (st)
9.4. Generic driver (sg)
10. Lower Level drivers
10.1. Pseudo drivers
11. Raw devices
12. Devfs pseudo file system
A. Common bus types (SCSI and other)
B. Changes between lk 2.2 and (during) 2.4
B.1. Mid level changes
B.2. sd changes
B.3. sr changes
B.4. st changes
B.5. sg changes
B.6. Changes during the lk 2.4 series
C. Troubleshooting
D. Performance, Test and Debugging tools
E. Compile options and System calls including ioctls
E.1. Mid level
E.2. sd driver
E.3. sr driver
E.4. st driver
E.5. sg driver
F. References, Credits and Corrections