1.\" Written by Tom Rhodes 2.\" This file is in the public domain. 3.\" 4.Dd November 6, 2025 5.Dt CISS 4 6.Os 7.Sh NAME 8.Nm ciss 9.Nd Common Interface for SCSI-3 Support driver 10.Sh SYNOPSIS 11To compile this driver into the kernel, 12place the following lines in your 13kernel configuration file: 14.Bd -ragged -offset indent 15.Cd "device scbus" 16.Cd "device ciss" 17.Ed 18.Pp 19Alternatively, to load the driver as a 20module at boot time, place the following line in 21.Xr loader.conf 5 : 22.Bd -literal -offset indent 23ciss_load="YES" 24.Ed 25.Sh DESCRIPTION 26The 27.Nm 28driver claims to provide a common interface between generic SCSI 29transports and intelligent host adapters. 30.Pp 31The 32.Nm 33driver supports 34.Em CISS 35as defined in the document entitled 36.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" , 37dated 2000/11/27, produced by Compaq Computer Corporation. 38.Pp 39We provide a shim layer between the 40.Nm 41interface and 42.Xr CAM 4 , 43offloading most of the queueing and being-a-disk chores onto CAM. 44Entry to the driver is via the PCI bus attachment 45.Fn ciss_probe , 46.Fn ciss_attach , 47etc.\& and via the CAM interface 48.Fn ciss_cam_action , 49and 50.Fn ciss_cam_poll . 51The Compaq 52.Nm 53adapters require faked responses to get reasonable 54behavior out of them. 55In addition, the 56.Nm 57command set is by no means adequate to support the functionality 58of a RAID controller, 59and thus the supported Compaq adapters utilize portions of the 60control protocol from earlier Compaq adapter families. 61.Pp 62Currently 63.Nm 64supports the 65.Dq simple 66and 67.Dq performant 68transport layer. 69.Pp 70Non-disk devices (such as internal DATs and devices 71attached to the external SCSI bus) are supported as normal CAM devices 72provided that they are exported by the controller firmware and are not 73marked as being masked. 74Masked devices can be exposed by setting the 75.Va hw.ciss.expose_hidden_physical 76tunable to non-zero at boot time. 77Direct Access devices (such as disk 78drives) are only exposed as 79.Xr pass 4 80devices. 81Hot-insertion and removal of devices is supported and notification messages 82will be reported to the console and logs. 83.Pp 84The problem which adapter freezes with the message 85.Dq ADAPTER HEARTBEAT FAILED 86might be solved by updating the firmware and/or setting the 87.Va hw.ciss.nop_message_heartbeat 88tunable to non-zero at boot time. 89.Sh HARDWARE 90The 91.Nm 92driver supports controllers implementing 93Common Interface for SCSI-3 Support Open Specification v1.04, including: 94.Pp 95.Bl -bullet -compact 96.It 97Compaq Smart Array 5300 (simple mode only) 98.It 99Compaq Smart Array 532 100.It 101Compaq Smart Array 5i 102.It 103HP Smart Array 5312 104.It 105HP Smart Array 6i 106.It 107HP Smart Array 641 108.It 109HP Smart Array 642 110.It 111HP Smart Array 6400 112.It 113HP Smart Array 6400 EM 114.It 115HP Smart Array E200 116.It 117HP Smart Array E200i 118.It 119HP Smart Array P212 120.It 121HP Smart Array P220i 122.It 123HP Smart Array P222 124.It 125HP Smart Array P230i 126.It 127HP Smart Array P400 128.It 129HP Smart Array P400i 130.It 131HP Smart Array P410 132.It 133HP Smart Array P410i 134.It 135HP Smart Array P411 136.It 137HP Smart Array P420 138.It 139HP Smart Array P420i 140.It 141HP Smart Array P421 142.It 143HP Smart Array P430 144.It 145HP Smart Array P430i 146.It 147HP Smart Array P431 148.It 149HP Smart Array P440ar 150.It 151HP Smart Array P530 152.It 153HP Smart Array P531 154.It 155HP Smart Array P600 156.It 157HP Smart Array P721m 158.It 159HP Smart Array P731m 160.It 161HP Smart Array P800 162.It 163HP Smart Array P812 164.It 165HP Smart Array P830 166.It 167HP Smart Array P830i 168.It 169HP Modular Smart Array 20 (MSA20) 170.It 171HP Modular Smart Array 500 (MSA500) 172.El 173.Sh SEE ALSO 174.Xr cam 4 , 175.Xr pass 4 , 176.Xr xpt 4 , 177.Xr loader.conf 5 , 178.Xr camcontrol 8 179.Rs 180.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" 181.%D 2000/11/27 182.%Q "Compaq Computer Corporation" 183.Re 184.Sh AUTHORS 185.An -nosplit 186The 187.Nm 188driver was written by 189.An Mike Smith Aq Mt msmith@FreeBSD.org . 190.Pp 191This manual page is based on his comments and was written by 192.An Tom Rhodes Aq Mt trhodes@FreeBSD.org . 193