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GNU/Linux |
Ubuntu 9.04(Jaunty Jackalope) |
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sg_prevent(8) |
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sg_prevent − sends a SCSI PREVENT ALLOW MEDIUM REMOVAL command
sg_prevent [−−allow] [−−help] [−−prevent=PC] [−−verbose] [−−version] DEVICE
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.
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.
The exit status of sg_prevent is 0 when it is successful. Otherwise see the sg3_utils(8) man page.
Written by Douglas Gilbert.
Report bugs to <dgilbert at interlog dot com>.
Copyright
© 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 PURPOSE.
sg_start(sg3_utils), sg_persist(sg3_utils)
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sg_prevent(8) | |