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LEARN ABOUT FREEBSD

ctl

CTL(4)							   BSD Kernel Interfaces Manual 						    CTL(4)

NAME

     ctl -- CAM Target Layer

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel configuration file:

	   device ctl

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   ctl_load="YES"

DESCRIPTION

     The ctl subsystem provides SCSI disk and processor emulation.  It supports features such as:

     o	 Disk and processor device emulation
     o	 Tagged queueing
     o	 SCSI task attribute support (ordered, head of queue, simple tags)
     o	 SCSI implicit command ordering support
     o	 Full task management support (abort, LUN reset, target reset, etc.)
     o	 Support for multiple ports
     o	 Support for multiple simultaneous initiators
     o	 Support for multiple simultaneous backing stores
     o	 Support for VMWare VAAI: COMPARE AND WRITE, XCOPY, WRITE SAME, and UNMAP commands
     o	 Support for Microsoft ODX: POPULATE TOKEN/WRITE USING TOKEN, WRITE SAME, and UNMAP commands
     o	 Persistent reservation support
     o	 Mode sense/select support
     o	 Error injection support
     o	 All I/O handled in-kernel, no userland context switch overhead

     It also serves as a kernel component of the native iSCSI target.

SEE ALSO

     ctladm(8), ctld(8), ctlstat(8)

HISTORY

     The ctl subsystem first appeared in FreeBSD 9.1.

AUTHORS

     The ctl subsystem was written by Kenneth Merry <ken@FreeBSD.org>.

BSD
								 October 23, 2014							       BSD

UNIX for Dummies Questions & Answers