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STBLOCKSIZE(8)							STBLOCKSIZE(8)

NAME
       stblocksize  -  Set the block transfer size of a SCSI tape device.

SYNOPSIS
       usretcstblocksize [ -v ] [ -s size ] device_pathname

DESCRIPTION
       stblocksize  determines	the maximum and minimum number of bytes that a
       SCSI tape device is capable of transfering to or from the computer in a
       single  hardware-level  transaction.	If the maximum and minimum are
       the same value, stblocksize places the device in fixed-block  mode  and
       will  use  that	value for all data transfers.	Otherwise, it sets the
       device to variable-block mode.

       This command is called by the etcrc script that is invoked  during  the
       bootup  sequence.   This means that tape drives connected to the system
       have their block size set automatically.

       Note that stblocksize controls the size of low-level data transfers  in
       hardware.  It should not be confused with the block sizes used in other
       commands like tar or dd which control the format of data as seen by the
       software at a higher level.

OPTIONS
       -v	   Verbose  mode.  Print  the  maximum	and minimum block size
		   reported by the device to standard output.

       -s size	   Set block size to  size,  regardless	 of  what  the	device
		   reports.

EXAMPLES
       The  following  command	causes the maximum and minimum block sizes for
       /dev/rst0 to be displayed on the output device:

       stblocksize -v /dev/rst0

       This command sets the transfer block size for /dev/rst0 to 512 bytes:

       stblocksize -s 512 /dev/rst0

SEE ALSO
       st(4),mt (1)

DIAGNOSTICS
       stblocksize returns a status of 0 for normal execution.	 It returns -1
       and  prints  a  diagnostic  message  if	it  is unable to interpret the
       command line, open the tape device, or retrieve	or  set	 the  device's
       block size.

BUGS
       stblocksize  cannot  correct  automatically for tape drives that report
       their block sizes incorrectly.	For such devices, you must execute the
       command	with  the  -s  option each time the system is booted (e.g., by
       modifying the command line in etcrc).

NeXT Computer, Inc.		 August 9 1994			STBLOCKSIZE(8)

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