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1.\" $FreeBSD$ 2.\" Written by Tom Rhodes 3.\" This file is public domain 4.\" 5.Dd August 8, 2004 6.Dt IDA 4 7.Os 8.Sh NAME 9.Nm ida 10.Nd Compaq Intelligent Drive Array Controllers 11.Sh SYNOPSIS 12To compile this driver into the kernel, 13place the following lines in your 14kernel configuration file: 15.Bd -ragged -offset indent 16.Cd "device scbus" 17.Cd "device ida" 18.Ed 19.Pp 20Alternatively, to load the driver as a 21module at boot time, place the following line in 22.Xr loader.conf 5 : 23.Bd -literal -offset indent 24ida_load="YES" 25.Ed 26.Sh DESCRIPTION 27The Compaq Intelligent Drive Array (IDA) technology is used to 28distribute data across an array of hard drives. 29It unites these hard drives into one or more high-performance logical drives. 30The drive array is managed by an array controller. 31.Pp 32These controllers have the ability to provide fault tolerance for the connected 33drives and optionally provide write cache for the logical drives. 34It is also possible for an application to access the SCSI bus subsystem 35directly by using the pass-through interface. 36.Sh HARDWARE 37The following controllers are supported by the 38.Nm 39driver: 40.Pp 41.Bl -bullet -compact 42.It 43Compaq SMART Array 221 44.It 45Compaq Integrated SMART Array Controller 46.It 47Compaq SMART Array 4200 48.It 49Compaq SMART Array 4250ES 50.It 51Compaq SMART 3200 Controller 52.It 53Compaq SMART 3100ES Controller 54.It 55Compaq SMART-2/DH Controller 56.It 57Compaq SMART-2/SL Controller 58.It 59Compaq SMART-2/P Controller 60.It 61Compaq SMART-2/E Controller 62.It 63Compaq SMART Controller 64.El 65.Sh IMPLEMENTATION NOTES 66Extreme caution should be exercised when using the pass-through interface. 67It is possible to interfere with normal system I/O and cause hangs if 68pass-through is used to an active device. 69Pass-through should only be used to a device that is otherwise quiescent. 70.Sh SEE ALSO 71.Xr cam 4 , 72.Xr pass 4 , 73.Xr xpt 4 , 74.Xr camcontrol 8 75.Sh AUTHORS 76.An -nosplit 77The 78.Nm 79driver was written by 80.An Jonathan Lemon Aq jlemon@FreeBSD.org 81and 82.An Matthew N. Dodd Aq mdodd@FreeBSD.org . 83This manual page was written by 84.An Tom Rhodes Aq trhodes@FreeBSD.org .