sg_prevent(8) [centos man page]

SG_PREVENT(8)							     SG3_UTILS							     SG_PREVENT(8)

NAME

       sg_prevent - send SCSI PREVENT ALLOW MEDIUM REMOVAL command

SYNOPSIS

       sg_prevent [--allow] [--help] [--prevent=PC] [--verbose] [--version] DEVICE

DESCRIPTION

       Sends  a SCSI PREVENT ALLOW MEDIUM REMOVAL command to DEVICE.  The default action of this utility is to prevent the removing or ejecting of
       the medium from a drive. This is done by ignoring the SCSI START STOP UNIT command (see sg_start) and ignoring  the  eject  button  on  the
       drive  when  the  user presses it. Drives that hold removable disks, tape cartridges or cd/dvd media typically implement this command.  The
       definition of the "prevent" codes for this command differ between disks and tapes (covered by SBC-3 and SSC-3) and cd/dvd  drives  (covered
       by MMC-5). The "prevent codes" described here are from MMC-5.

OPTIONS

       Arguments to long options are mandatory for short options as well.

       -a, --allow
	      allow  medium  removal. This is equivalent to setting to '--prevent=2'.  Cannot be used with --prevent=PC option (i.e. either use no
	      options (hence prevent removal), this option or --prevent=PC).

       -h, --help
	      output the usage message then exit.

       -p, --prevent=PC
	      where PC is a prevent code value. Defined values are: 0 allows removal, 1 prevents removal (default), 2  allows  persistent  removal
	      while  3	prevents  persistent  removal.	"Persistent" in this context means that the initiator (port) that successfully uses code 3
	      blocks other initiators (ports) from allowing removal. A "persistent prevent" state can be cleared by the owner allowing	persistent
	      removal  (code  2) or a power cycle (or anything that resets the device (LU)) or some special commands (e.g. various service actions
	      of Persistent Reserve Out, see SPC-3).

       -v, --verbose
	      increase the level of verbosity, (i.e. debug output).

       -V, --version
	      print the version string and then exit.

EXIT STATUS

       The exit status of sg_prevent is 0 when it is successful. Otherwise see the sg3_utils(8) man page.

AUTHORS

       Written by Douglas Gilbert.

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright (C) 2004-2012 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A  PARTICULAR  PUR-
       POSE.

SEE ALSO

       sg_start(sg3_utils), sg_persist(sg3_utils)

sg3_utils-1.35							   November 2012						     SG_PREVENT(8)

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SCSI_READCAP(8) 						     SG3_UTILS							   SCSI_READCAP(8)

NAME

       scsi_readcap - do SCSI READ CAPACITY command on disks

SYNOPSIS

       scsi_readcap [--brief] [--help] [--long] [--verbose] DEVICE [DEVICE]*

DESCRIPTION

       This Bourne shell script calls the sg_readcap utility on each given DEVICE. This will send a SCSI READ CAPACITY command to each DEVICE.

       The  default  action of this script is to send the 10 byte cdb READ CAPACITY(10) command to each DEVICE. If a response indicates the number
       of blocks is greater than or equal to '2**32 - 1' then the READ CAPACITY(16) is sent and its response is output.

OPTIONS

       Arguments to long options are mandatory for short options as well.

       -b, --brief
	      shortens the output to two hexadecimal numbers, both prefixed by '0x'.  The first number is the number of blocks available  and  the
	      second  is  the  size  of each blocks in bytes (e.g. '0x12a19eb0 0x200'). If an error is detected '0x0 0x0' is output and the script
	      continues if there are more DEVICEs.

       -h, --help
	      print out the usage message then exit.

       -l, --long
	      the default is to send the READ CAPACITY(10) command (i.e. the 10 byte cdb variant). When this option is given the READ CAPACITY(16)
	      command is sent. The latter command yields more information in its response.

       -v, --verbose
	      increase level or verbosity.

EXIT STATUS

       The exit status of this script is 0 when it is successful. Otherwise the exit status is that of the last sg_readcap utility called. See the
       sg3_utils(8) man page.

AUTHORS

       Written by D. Gilbert

COPYRIGHT

       Copyright (C) 2009 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A  PARTICULAR  PUR-
       POSE.

SEE ALSO

       sg_readcap (sg3_utils)

sg3_utils-1.28							   October 2009 						   SCSI_READCAP(8)

Linux and UNIX Man Pages

sg_prevent(8) [centos man page]

Check Out this Related Man Page