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Full Discussion: major & minor number
Operating Systems Solaris major & minor number Post 53630 by Perderabo on Wednesday 21st of July 2004 06:45:41 AM
Old 07-21-2004
There are several different drivers in a system. For example if your system has a disk drive and tape drive, there would be one driver for the disk and another driver for the tape drive. Each driver gets a number called the major number. The major number just tells the kernel which driver to use.

The minor number is passed to the driver. The driver could ignore it. Or the driver can interpret any way it wants. Usually there are sub fields in the minor number. In the case of a tape driver, one sub field would say which particular tape drive to use. Another sub field might say whether or not to automatically rewind the tape when the file is closed.
 

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LEARN ABOUT REDHAT

tapeinfo

TAPEINFO(1)						      General Commands Manual						       TAPEINFO(1)

NAME

       tapeinfo - report SCSI tape device info

SYNOPSIS

       tapeinfo -f <scsi-generic-device>

DESCRIPTION

       The  tapeinfo  command  reads  various information from SCSI tape drives that is not generally available via most vendors' tape drivers. It
       issues raw commands directly to the tape drive, using either the  operating  system's  SCSI  generic  device  (	e.g.  /dev/sg0	on  Linux,
       /dev/pass0 on FreeBSD) or the raw SCSI I/O ioctl on a tape device on some operating systems.

       One  good  time	to  use 'tapeinfo' is immediately after a tape i/o operation has failed. On tape drives that support HP's 'tapealert' API,
       'tapeinfo' will report a more exact description of what went wrong.

       Do be aware that 'tapeinfo' is not a substitute for your operating system's own 'mt' or similar tape driver control program. It is intended
       to supplement, not replace, programs like 'mt' that access your operating system's tape driver in order to report or set information.

OPTIONS

       The first argument, given following -f , is the SCSI generic device corresponding to your tape drive.  Consult your operating system's doc-
       umentation for more information (for example, under Linux these are generally start at /dev/sg0 under FreeBSD these start at /dev/pass0).

       Under FreeBSD, 'camcontrol devlist' will tell you what SCSI devices you have, along with which 'pass' device controls  them.  Under  Linux,
       "cat /proc/scsi/scsi" will tell you what SCSI devices you have.

BUGS AND LIMITATIONS

       This program has only been tested on Linux with a limited number of tape drives (HP DDS4, Seagate AIT).

AVAILABILITY

       tapeinfo  is  currently being maintained by Eric Lee Green <eric@badtux.org> formerly of Enhanced Software Technologies Inc. The 'mtx' home
       page is http://mtx.sourceforge.net and the actual code is currently available there and via CVS from http://sourceforge.net/projects/mtx/ .

SEE ALSO

       mt(1),mtx(1),scsitape(1)

								    TAPEINFO1.0 						       TAPEINFO(1)
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