Provided by: freebsd-manpages_10.1~RC1-1_all bug


     ciss — Common Interface for SCSI-3 Support driver


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

           device scbus
           device ciss

     Alternatively, to load the driver as a module at boot time, place the following line in



     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 Corporation.

     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 supports the “simple” and “performant” transport layer.

     Non-disk devices (such as internal DATs and devices attached to the external SCSI bus) are
     supported as normal CAM devices provided that they are exported by the controller firmware
     and are not marked as being masked.  Masked devices can be exposed by setting the
     hw.ciss.expose_hidden_physical tunable to non-zero at boot time.  Direct Access devices
     (such as disk drives) are only exposed as pass(4) devices.  Hot-insertion and removal of
     devices is supported and notification messages will be reported to the console and logs.

     The problem which adapter freezes with the message “ADAPTER HEARTBEAT FAILED” might be
     solved by updating the firmware and/or setting the hw.ciss.nop_message_heartbeat tunable to
     non-zero at boot time.


     Controllers supported by the ciss driver include:

     ·   Compaq Smart Array 5300 (simple mode only)
     ·   Compaq Smart Array 532
     ·   Compaq Smart Array 5i
     ·   HP Smart Array 5312
     ·   HP Smart Array 6i
     ·   HP Smart Array 641
     ·   HP Smart Array 642
     ·   HP Smart Array 6400
     ·   HP Smart Array 6400 EM
     ·   HP Smart Array E200
     ·   HP Smart Array E200i
     ·   HP Smart Array P212
     ·   HP Smart Array P220i
     ·   HP Smart Array P222
     ·   HP Smart Array P230i
     ·   HP Smart Array P400
     ·   HP Smart Array P400i
     ·   HP Smart Array P410
     ·   HP Smart Array P410i
     ·   HP Smart Array P411
     ·   HP Smart Array P420
     ·   HP Smart Array P420i
     ·   HP Smart Array P421
     ·   HP Smart Array P430
     ·   HP Smart Array P430i
     ·   HP Smart Array P431
     ·   HP Smart Array P530
     ·   HP Smart Array P531
     ·   HP Smart Array P600
     ·   HP Smart Array P721m
     ·   HP Smart Array P731m
     ·   HP Smart Array P800
     ·   HP Smart Array P812
     ·   HP Smart Array P830
     ·   HP Smart Array P830i
     ·   HP Modular Smart Array 20 (MSA20)
     ·   HP Modular Smart Array 500 (MSA500)


     cam(4), pass(4), xpt(4), loader.conf(5), camcontrol(8)

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


     The ciss driver was written by Mike Smith <>.

     This manual page is based on his comments and was written by Tom Rhodes