diskinfo(8) [freebsd man page]

DISKINFO(8)						    BSD System Manager's Manual 					       DISKINFO(8)

NAME

     diskinfo -- get information about disk device

SYNOPSIS

     diskinfo [-ctv] disk ...

DESCRIPTION

     The diskinfo utility prints out information about a disk device, and optionally runs a naive performance test on the device.

     If given no arguments, the output will be a single line per specified device with the following fields: device name, sectorsize, media size
     in bytes, media size in sectors, stripe size, stripe offset, firmware cylinders, firmware heads, and firmware sectors.  The last three fields
     are only present if the information is available.

     If given the -v option, the fields will be printed one per line with a descriptive comment.

     The -c option triggers a simple measurement of the I/O read command overhead.

     The -t option triggers a simple and rather naive benchmark of the disks seek and transfer performance.

HISTORY

     The diskinfo command appeared in FreeBSD 5.1.

AUTHORS

     Poul-Henning Kamp

BUGS

     There are in order of increasing severity: lies, damn lies, statistics, and computer benchmarks.

BSD
								 November 9, 2004							       BSD

diskinfo(1M)															      diskinfo(1M)

NAME

       diskinfo - describe characteristics of a disk device

SYNOPSIS

       character_devicefile

DESCRIPTION

       The command determines whether the character special file named by character_devicefile is associated with a SCSI or floppy disk drive.	If
       so, summarizes the disk's characteristics.

       The command displays information about the following characteristics of disk drives:

	      Vendor name    Manufacturer of the drive (SCSI only)
	      Product ID     Product identification number or ASCII name
	      Type	     Floppy or SCSI classification for the device
	      Disk	     Size of disk specified in bytes
	      Sector	     Specified as bytes per sector

       Both the size of disk and bytes per sector represent formatted media.

   Options
       The command recognizes the following options:

	      Return the size of the disk in 1024-byte sectors.

	      Display a verbose summary of all of the information
		      available from the device.  For floppy drives, this option has no effect.

		      SCSI disk devices return the following:
			Vendor and product ID
			Device type
			Size (in bytes and in logical blocks)
			Bytes per sector
			Revision level
			SCSI conformance level data

DIAGNOSTICS

       Most of the diagnostic messages from are self-explanatory.  However, one diagnostic message deserves further clarification.  If the command
       fails  to access the lunpath corresponding to a given special file, it displays the following diagnostics data, which contains device iden-
       tification and capability information:

	    device type 127 (unknown); device is inaccessible
	    iso ecma ansi rmb dtq resv rdf

WARNINGS

       As of release 10.20 of HP-UX, certain IDE devices, CD-ROMs in particular, will respond to inquiries as if they were SCSI  devices.   There-
       fore, the text "SCSI describe" in the output of the command does not definitively mean that the disk is in fact a SCSI drive (especially in
       the case of CD-ROMs).  Use to check which type of INTERFACE node, SCSI or IDE, the device's hardware path lies beneath, in order to defini-
       tively determine a drive's interface.

DEPENDENCIES

   General
       The command supports floppy and HP SCSI disk devices.

   SCSI Devices
       The  SCSI specification provides for a wide variety of device-dependent formats.  For non-HP devices, may be unable to interpret all of the
       data returned by the device.  Refer to the drive operating manual accompanying the unit for more information.

AUTHOR

       was developed by HP.

SEE ALSO

       ioscan(1M), lsdev(1M), disktab(4), disk(7).

																      diskinfo(1M)