reasb man page on NeXTSTEP

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REASB(8)							      REASB(8)

NAME
       reasb - reassign SCSI logical block

SYNOPSIS
       /usr/etc/reasb raw_device SCSI_block_number [ -r ]

DESCRIPTION
       This  command  causes  a	 logical  block	 on  a	SCSI  disk drive to be
       reassigned to a new location on the disk.  The  actual  relocation  and
       reassignment  is	 performed  by	the  disk  drive  (as  opposed	to the
       operating system). The algorithms used to allocate spare	 sectors  vary
       between	drive  manufacturers.  SCSI_block_number is generally obtained
       from console error information, printed by the SCSI  disk  driver  upon
       detection   of  media  errors  reported	by  the	 drive	during	normal
       operation.

OPTIONS
       -r     When this flag is specified, 20 attempts are made	 to  read  the
	      current  contents of SCSI_block_number.  If any one read attempt
	      is  successful,  the  reassignment  takes	 place	and  then  the
	      previously  read	contents of SCSI_block_number are written back
	      to the newly relocated sector.  If all 20 read  attempts	result
	      in errors, the user will be notified and asked whether or not to
	      continue with  the  reassign  block  command.   Responding  with
	      anything	other  than 'y' results in the operation being aborted
	      with no further I/O.

FILES
       /dev/rsd?

SEE ALSO
       sd(4)

BUGS
       Some SCSI drives do not implement  the  SCSI  Reassign  Block  command;
       reasb will fail on these drives. Also, blocks in a given area of a disk
       can in general only be reassigned a small number of  times  before  the
       drive  runs  out	 of  spare locations. The reasb command should be used
       sparingly.

       The reasb command takes a decimal SCSI block number as an argument, but
       the sd driver reports media errors in hexadecimal.

NeXT Computer, Inc.		August 30, 1989			      REASB(8)
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