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Old 10-25-2008
Technology could help prevent stock market crashes and abuse
by Karl Flinders, ComputerWeekly.com Specialist supplier Progress Apama has launched a real time complex event monitoring software,which it claims could prevent stock markets crashing and rogue traders committing fraud. The firm’s Risk Firewall is designed to monitor complex events in real time and block them if necessary to reduce the effects of mistakes or fraud. The volatility [...]

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LEARN ABOUT SUSE

sg_prevent

SG_PREVENT(8)							     SG3_UTILS							     SG_PREVENT(8)

NAME

       sg_prevent - sends a 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 (lun)) 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) 2004-2007 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-1.23							   January 2007 						     SG_PREVENT(8)