1.\" $FreeBSD: src/share/man/man4/ciss.4,v 1.2.2.3 2003/03/03 18:51:16 trhodes Exp $ 2.\" Written by Tom Rhodes 3.\" This file is in the public domain. 4.\" 5.Dd December 29, 2002 6.Dt CISS 4 7.Os 8.Sh NAME 9.Nm ciss 10.Nd Common Interface for SCSI-3 Support driver 11.Sh SYNOPSIS 12.Cd "device scbus" 13.Cd "device ciss" 14.Sh DESCRIPTION 15The 16.Nm 17driver claims to provide a common interface between generic SCSI 18transports and intelligent host adapters. 19.Pp 20The 21.Nm 22driver supports 23.Em CISS 24as defined in the document entitled 25.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" , 26dated 2000/11/27, produced by Compaq Computer Corporation. 27.Pp 28We provide a shim layer between the 29.Nm 30interface and 31.Xr CAM 4 , 32offloading most of the queueing and being-a-disk chores onto CAM. 33Entry to the driver is via the PCI bus attachment 34.Fn ciss_probe , 35.Fn ciss_attach , 36etc. and via the CAM interface 37.Fn ciss_cam_action , 38and 39.Fn ciss_cam_poll . 40The Compaq 41.Nm 42adapters require faked responses to get reasonable 43behavior out of them. 44In addition, the 45.Nm 46command set is by no means adequate to support the functionality 47of a RAID controller, 48and thus the supported Compaq adapters utilize portions of the 49control protocol from earlier Compaq adapter families. 50.Pp 51Currently 52.Nm 53only supports the 54.Dq simple 55transport layer over PCI. 56This interface (ab)uses the I2O register set (specifically the post 57queues) to exchange commands with the adapter. 58Other interfaces are available, but we are not supposed to know about them, 59and it is dubious whether they would provide major performance improvements 60except under extreme load. 61.Pp 62Non-disk devices (such as internal DATs and devices 63attached to the external SCSI bus) are not yet supported. 64.Pp 65Supported controllers include: 66.Pp 67.Bl -item -compact 68.It 69Compaq Smart Array 5300 70.It 71Compaq Smart Array 532 72.It 73Compaq Smart Array 5i 74.El 75.Sh SEE ALSO 76.Xr cam 4 , 77.Xr pass 4 , 78.Xr xpt 4 , 79.Xr camcontrol 8 80.Rs 81.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" 82.%D 2000/11/27 83.%Q "Compaq Computer Corporation" 84.Re 85.Sh AUTHORS 86.An -nosplit 87The 88.Nm 89driver was written by 90.An Mike Smith Aq msmith@FreeBSD.org . 91.Pp 92This manual page is based on his comments and was written by 93.An Tom Rhodes Aq trhodes@FreeBSD.org . 94