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CISS(4)		       FreeBSD Kernel Interfaces Manual		       CISS(4)

NAME
     ciss -- Common Interface for SCSI-3 Support driver

SYNOPSIS
     device scbus
     device ciss

DESCRIPTION
     The ciss driver claims to provide a common	interface between generic SCSI
     transports	and intelligent	host adapters.

     The ciss driver supports CISS as defined in the document entitled CISS
     Command Interface for SCSI-3 Support Open Specification, Version 1.04,
     Valence Number 1, dated 2000/11/27, produced by Compaq Computer Corpora-
     tion.

     We	provide	a shim layer between the ciss interface	and CAM(4), offloading
     most of the queueing and being-a-disk chores onto CAM.  Entry to the
     driver is via the PCI bus attachment ciss_probe(),	ciss_attach(), etc.
     and via the CAM interface ciss_cam_action(), and ciss_cam_poll().	The
     Compaq ciss adapters require faked	responses to get reasonable behavior
     out of them.  In addition,	the ciss command set is	by no means adequate
     to	support	the functionality of a RAID controller,	and thus the supported
     Compaq adapters utilize portions of the control protocol from earlier
     Compaq adapter families.

     Currently ciss only supports the ``simple'' transport layer over PCI.
     This interface (ab)uses the I2O register set (specifically	the post
     queues) to	exchange commands with the adapter.  Other interfaces are
     available,	but we are not supposed	to know	about them, and	it is dubious
     whether they would	provide	major performance improvements except under
     extreme load.

     Non-disk devices (such as internal	DATs and devices attached to the
     external SCSI bus)	are not	yet supported.

     Supported controllers include:

     Compaq Smart Array	5300
     Compaq Smart Array	532
     Compaq Smart Array	5i

SEE ALSO
     cam(4), pass(4), xpt(4), camcontrol(8)

     CISS Command Interface for	SCSI-3 Support Open Specification, Version
     1.04, Valence Number 1, Compaq Computer Corporation, 2000/11/27.

AUTHORS
     The ciss driver was written by Mike Smith <msmith@FreeBSD.org>.

     This manual page is based on his comments and was written by Tom Rhodes
     <trhodes@FreeBSD.org>.

FreeBSD	10.1		       December	29, 2002		  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHORS

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