128 lines
2.9 KiB
Groff
128 lines
2.9 KiB
Groff
.\" $FreeBSD$
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.\" Written by Tom Rhodes
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.\" This file is in the public domain.
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.\"
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.Dd August 3, 2004
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.Dt CISS 4
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.Os
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.Sh NAME
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.Nm ciss
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.Nd Common Interface for SCSI-3 Support driver
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.Sh SYNOPSIS
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.Cd "device scbus"
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.Cd "device ciss"
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.Sh DESCRIPTION
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The
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.Nm
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driver claims to provide a common interface between generic SCSI
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transports and intelligent host adapters.
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.Pp
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The
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.Nm
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driver supports
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.Em CISS
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as defined in the document entitled
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.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" ,
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dated 2000/11/27, produced by Compaq Computer Corporation.
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.Pp
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We provide a shim layer between the
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.Nm
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interface and
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.Xr CAM 4 ,
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offloading most of the queueing and being-a-disk chores onto CAM.
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Entry to the driver is via the PCI bus attachment
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.Fn ciss_probe ,
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.Fn ciss_attach ,
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etc.\& and via the CAM interface
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.Fn ciss_cam_action ,
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and
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.Fn ciss_cam_poll .
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The Compaq
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.Nm
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adapters require faked responses to get reasonable
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behavior out of them.
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In addition, the
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.Nm
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command set is by no means adequate to support the functionality
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of a RAID controller,
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and thus the supported Compaq adapters utilize portions of the
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control protocol from earlier Compaq adapter families.
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.Pp
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Currently
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.Nm
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only supports the
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.Dq simple
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transport layer over PCI.
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This interface (ab)uses the I2O register set (specifically the post
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queues) to exchange commands with the adapter.
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Other interfaces are available, but we are not supposed to know about them,
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and it is dubious whether they would provide major performance improvements
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except under extreme load.
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.Pp
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Non-disk devices (such as internal DATs and devices
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attached to the external SCSI bus) are supported as normal CAM devices
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provided that they are exported by the controller firmware and are not
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marked as being masked.
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Masked devices can be exposed by setting the
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.Va hw.ciss.expose_hidden_physical
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tunable to non-zero at boot time.
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Direct Access devices (such as disk
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drives) are only exposed as
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.Xr pass 4
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devices.
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Hot-insertion and removal of devices is supported but a bus
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rescan might be necessary.
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.Sh HARDWARE
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Controllers supported by the
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.Nm
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driver include:
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.Pp
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.Bl -bullet -compact
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.It
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Compaq Smart Array 5300
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.It
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Compaq Smart Array 532
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.It
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Compaq Smart Array 5i
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.It
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HP Smart Array 5312
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.It
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HP Smart Array 6i
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.It
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HP Smart Array 641
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.It
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HP Smart Array 642
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.It
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HP Smart Array 6400
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.It
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HP Smart Array 6400 EM
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.It
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HP Smart Array 6422
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.It
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HP Smart Array V100
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.It
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HP Modular Smart Array 20 (MSA20)
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.It
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HP Modular Smart Array 500 (MSA500)
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.El
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.Sh SEE ALSO
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.Xr cam 4 ,
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.Xr pass 4 ,
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.Xr xpt 4 ,
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.Xr loader.conf 5 ,
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.Xr camcontrol 8
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.Rs
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.%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1"
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.%D 2000/11/27
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.%Q "Compaq Computer Corporation"
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.Re
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Mike Smith Aq msmith@FreeBSD.org .
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.Pp
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This manual page is based on his comments and was written by
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.An Tom Rhodes Aq trhodes@FreeBSD.org .
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