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

     ciss - Common Interface for SCSI-3 Support driver.

     For one or more adapters:
     device scbus
     device ciss

     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 20001127, produced by Compaq Computer

     We provide a shim layer between the ciss interface and CAM, 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

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

     ``CISS Command Interface for SCSI-3 Support Open Specification, Version
     1.04,'' Valence Number 1, dated 20001127, produced by Compaq Computer

     The ciss driver was written by Mike Smith <>.  This
     manual page is based on his comments and was written by

FreeBSD 11.0-PRERELEASE        December 29, 2002       FreeBSD 11.0-PRERELEASE


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