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ciss — Common Interface for SCSI-3 Support driver
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
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
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 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 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 but a bus rescan might
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
· 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 P400
· HP Smart Array P400i
· HP Smart Array P410
· HP Smart Array P410i
· HP Smart Array P411
· HP Smart Array P600
· HP Smart Array P800
· HP Smart Array P812
· 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 ⟨msmith@FreeBSD.org⟩.
This manual page is based on his comments and was written by Tom Rhodes