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SunOS 5.5 Devices iss(7D)

NAME iss − low-level module for Tricord System’s SCSI host bus adapter

SYNOPSIS iss@slotc8bus,0

AVAILABILITY x86

DESCRIPTION The iss module provides low-level interface routines between the common disk/tape

(see cmdk(7D) and st(7D)) I/O subsystem and Tricord System’s Intelligent SCSI Subsys-

tem (ISS) controllers. The iss module can be conﬁgured for hard disk, CD-ROM and

streaming tape support for one or more ISS boards. Auto conﬁguration code determines

which ISS boards are present and what types of devices are attached to them.

The ISS family of controllers are proprietary multi-channel SCSI controllers. Data

transfers to/from the ISS occur at system bus speeds as the controller resides directly on

the system bus. The ISS comes in a 2 and 4 bus models and supports either singleended

or differential devices. Caching and non-caching models of these controllers are avail-

able. Some models of the controller support 7 devices per bus while newer versions sup-

port wide SCSI and 15 devices per SCSI bus. Each ISS reserves SCSI id 0 on each bus

leaving ids 1-(7 or 15 if wide) available for devices. A 4 channel ISS supports up to 28 (or

60 if wide) devices across the 4 busses. Multiple controllers can exist in the same machine.

Up to 4 ISSs can be conﬁgured into the ES3000, and up to 6 ISS’s can be conﬁgured in the

ES4000, ES5000 models. A six ISS conﬁguration machine supports up to 360 SCSI devices.

This driver supports up to 6 ISS boards.

The controller ﬁrmware is driven either by an Intel 386 or 486 DX2 processor. The ISS

can support standard physical disk drives, RAID 0, RAID 1, RAID 4, RAID 5 and RAID

1/0 (mirrored stripes ) logical disk devices. These logical devices are conﬁgured by the

DOS utility PowerRaid and are supported by this driver. Their logical nature is tran-

sparent to Solaris x86. SCSI tape and CDROM devices are also supported.

Implementation This driver is implemented as a standard SCSI HBA driver. It is multiprocessor safe and

is designed to operate most efﬁciently in a multiprocessor environment.

Multi-bus support is achieved by making each bus appear as a separate physical host bus

adapter as far as Solaris x86 is concerned. Each possible bus of each possible ISS is

conﬁgured via the iss.conf ﬁle. Groups of busses forming a physical ISS are controlled

internally by the driver.

There are two primary code paths thru the driver: one for physical devices (disk, tape,

cdrom) and another for logical disk devices raid 0,1,4,5,1/0. Tables are built at initializa-

tion time by the driver that allow easy determination (based on the SCSI address) as to

whether a device is physical or logical.

Device Naming

Convention

This sub-section describes how the special device ﬁles in the directories /dev/dsk and

/dev/rdsk are used on an ISS system. Since these are multichannel controllers, each bus

of each controller has a different controller number. So for a system containing 2 4-

channel ISS SCSI controllers, ISS 0 busses 0-3 may have controller 0-3 devices, respec-

tively, and ISS 1 busses 0-3 may have controllers 4-7 devices, respectively.

modiﬁed 23 Jan 1995 7D-169

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