1.\" $FreeBSD$ 2.\" Written by Tom Rhodes 3.\" This file is in the public domain. 4.\" 5.Dd November 3, 2005 6.Dt CISS 4 7.Os 8.Sh NAME 9.Nm ciss 10.Nd Common Interface for SCSI-3 Support driver 11.Sh SYNOPSIS 12To compile this driver into the kernel, 13place the following lines in your 14kernel configuration file: 15.Bd -ragged -offset indent 16.Cd "device scbus" 17.Cd "device ciss" 18.Ed 19.Pp 20Alternatively, to load the driver as a 21module at boot time, place the following line in 22.Xr loader.conf 5 : 23.Bd -literal -offset indent 24ciss_load="YES" 25.Ed 26.Sh DESCRIPTION 27The 28.Nm 29driver claims to provide a common interface between generic SCSI 30transports and intelligent host adapters. 31.Pp 32The 33.Nm 34driver supports 35.Em CISS 36as defined in the document entitled 37.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" , 38dated 2000/11/27, produced by Compaq Computer Corporation. 39.Pp 40We provide a shim layer between the 41.Nm 42interface and 43.Xr CAM 4 , 44offloading most of the queueing and being-a-disk chores onto CAM. 45Entry to the driver is via the PCI bus attachment 46.Fn ciss_probe , 47.Fn ciss_attach , 48etc.\& and via the CAM interface 49.Fn ciss_cam_action , 50and 51.Fn ciss_cam_poll . 52The Compaq 53.Nm 54adapters require faked responses to get reasonable 55behavior out of them. 56In addition, the 57.Nm 58command set is by no means adequate to support the functionality 59of a RAID controller, 60and thus the supported Compaq adapters utilize portions of the 61control protocol from earlier Compaq adapter families. 62.Pp 63Currently 64.Nm 65only supports the 66.Dq simple 67transport layer over PCI. 68This interface (ab)uses the I2O register set (specifically the post 69queues) to exchange commands with the adapter. 70Other interfaces are available, but we are not supposed to know about them, 71and it is dubious whether they would provide major performance improvements 72except under extreme load. 73.Pp 74Non-disk devices (such as internal DATs and devices 75attached to the external SCSI bus) are supported as normal CAM devices 76provided that they are exported by the controller firmware and are not 77marked as being masked. 78Masked devices can be exposed by setting the 79.Va hw.ciss.expose_hidden_physical 80tunable to non-zero at boot time. 81Direct Access devices (such as disk 82drives) are only exposed as 83.Xr pass 4 84devices. 85Hot-insertion and removal of devices is supported but a bus 86rescan might be necessary. 87.Sh HARDWARE 88Controllers supported by the 89.Nm 90driver include: 91.Pp 92.Bl -bullet -compact 93.It 94Compaq Smart Array 5300 95.It 96Compaq Smart Array 532 97.It 98Compaq Smart Array 5i 99.It 100HP Smart Array 5312 101.It 102HP Smart Array 6i 103.It 104HP Smart Array 641 105.It 106HP Smart Array 642 107.It 108HP Smart Array 6400 109.It 110HP Smart Array 6400 EM 111.It 112HP Smart Array E200 113.It 114HP Smart Array E200i 115.It 116HP Smart Array P400 117.It 118HP Smart Array P400i 119.It 120HP Smart Array P600 121.It 122HP Smart Array P800 123.It 124HP Modular Smart Array 20 (MSA20) 125.It 126HP Modular Smart Array 500 (MSA500) 127.El 128.Sh SEE ALSO 129.Xr cam 4 , 130.Xr pass 4 , 131.Xr xpt 4 , 132.Xr loader.conf 5 , 133.Xr camcontrol 8 134.Rs 135.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" 136.%D 2000/11/27 137.%Q "Compaq Computer Corporation" 138.Re 139.Sh AUTHORS 140.An -nosplit 141The 142.Nm 143driver was written by 144.An Mike Smith Aq msmith@FreeBSD.org . 145.Pp 146This manual page is based on his comments and was written by 147.An Tom Rhodes Aq trhodes@FreeBSD.org . 148