1 .\" $FreeBSD: src/share/man/man4/ciss.4,v 1.2.2.6 2008/06/10 18:51:05 ps Exp $
2 .\" $DragonFly: src/share/man/man4/ciss.4,v 1.2 2003/06/17 04:36:58 dillon Exp $
3 .\" Written by Tom Rhodes
4 .\" This file is in the public domain.
11 .Nd Common Interface for SCSI-3 Support driver
18 driver claims to provide a common interface between generic SCSI
19 transports and intelligent host adapters.
25 as defined in the document entitled
26 .%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" ,
27 dated 2000/11/27, produced by Compaq Computer Corporation.
29 We provide a shim layer between the
33 offloading most of the queueing and being-a-disk chores onto CAM.
34 Entry to the driver is via the PCI bus attachment
37 etc. and via the CAM interface
43 adapters require faked responses to get reasonable
47 command set is by no means adequate to support the functionality
49 and thus the supported Compaq adapters utilize portions of the
50 control protocol from earlier Compaq adapter families.
56 transport layer over PCI.
57 This interface (ab)uses the I2O register set (specifically the post
58 queues) to exchange commands with the adapter.
59 Other interfaces are available, but we are not supposed to know about them,
60 and it is dubious whether they would provide major performance improvements
61 except under extreme load.
63 Non-disk devices (such as internal DATs and devices
64 attached to the external SCSI bus) are supported as normal CAM devices
65 provided that they are exported by the controller firmware and are not
66 marked as being masked.
67 Masked devices can be exposed by setting the
68 .Va hw.ciss.expose_hidden_physical
69 tunable to non-zero at boot time.
70 Direct Access devices (such as disk drives) are only exposed as
73 Hot-insertion and removal of devices is supported but a bus
74 rescan might be necessary.
76 Supported controllers include:
80 Compaq Smart Array 5300
82 Compaq Smart Array 532
96 HP Smart Array 6400 EM
120 HP Modular Smart Array 20 (MSA20)
122 HP Modular Smart Array 500 (MSA500)
130 .%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1"
132 .%Q "Compaq Computer Corporation"
138 driver was written by
139 .An Mike Smith Aq msmith@FreeBSD.org .
141 This manual page is based on his comments and was written by
142 .An Tom Rhodes Aq trhodes@FreeBSD.org .