2 .\" Written by Tom Rhodes
3 .\" This file is in the public domain.
10 .Nd Common Interface for SCSI-3 Support driver
17 driver claims to provide a common interface between generic SCSI
18 transports and intelligent host adapters.
24 as defined in the document entitled
25 .%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1" ,
26 dated 2000/11/27, produced by Compaq Computer Corporation.
28 We provide a shim layer between the
32 offloading most of the queueing and being-a-disk chores onto CAM.
33 Entry to the driver is via the PCI bus attachment
36 etc.\& and via the CAM interface
42 adapters require faked responses to get reasonable
46 command set is by no means adequate to support the functionality
48 and thus the supported Compaq adapters utilize portions of the
49 control protocol from earlier Compaq adapter families.
55 transport layer over PCI.
56 This interface (ab)uses the I2O register set (specifically the post
57 queues) to exchange commands with the adapter.
58 Other interfaces are available, but we are not supposed to know about them,
59 and it is dubious whether they would provide major performance improvements
60 except under extreme load.
62 Non-disk devices (such as internal DATs and devices
63 attached to the external SCSI bus) are supported as normal CAM devices
64 provided that they are exported by the controller firmware and are not
65 marked as being masked.
66 Masked devices can be exposed by setting the
67 .Va hw.ciss.expose_hidden_physical
68 tunable to non-zero at boot time.
69 Direct Access devices (such as disk
70 drives) are only exposed as
73 Hot-insertion and removal of devices is supported but a bus
74 rescan might be necessary.
76 Controllers supported by the
82 Compaq Smart Array 5300
84 Compaq Smart Array 532
98 HP Smart Array 6400 EM
112 HP Modular Smart Array 20 (MSA20)
114 HP Modular Smart Array 500 (MSA500)
123 .%T "CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1"
125 .%Q "Compaq Computer Corporation"
131 driver was written by
132 .An Mike Smith Aq msmith@FreeBSD.org .
134 This manual page is based on his comments and was written by
135 .An Tom Rhodes Aq trhodes@FreeBSD.org .