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ida(4)

NAME

     ida -- Compaq Intelligent Drive Array Controllers

SYNOPSIS

     device scbus
     device ida

DESCRIPTION

     The Compaq Intelligent Drive Array (IDA) technology is used to distribute
     data across an array of hard drives.  It unites these hard drives into
     one or more high-performance logical drives.  The drive array is managed
     by an array controller.

     These controllers have the ability to provide fault tolerance for the
     connected drives and optionally provide write cache for the logical
     drives.  It is also possible for an application to access the SCSI bus
     subsystem directly by using the pass-through interface.

HARDWARE

     The following controllers are supported by the ida driver:

     o	 Compaq SMART Array 221
     o	 Compaq Integrated SMART Array Controller
     o	 Compaq SMART Array 4200
     o	 Compaq SMART Array 4250ES
     o	 Compaq SMART 3200 Controller
     o	 Compaq SMART 3100ES Controller
     o	 Compaq SMART-2/DH Controller
     o	 Compaq SMART-2/SL Controller
     o	 Compaq SMART-2/P Controller
     o	 Compaq SMART-2/E Controller
     o	 Compaq SMART Controller

IMPLEMENTATION NOTES

     Extreme caution should be exercised when using the pass-through inter-
     face.  It is possible to interfere with normal system I/O and cause hangs
     if pass-through is used to an active device.  Pass-through should only be
     used to a device that is otherwise quiescent.

SEE ALSO

     cam(4), pass(4), xpt(4), camcontrol(8)

AUTHORS

     The ida driver was written by Jonathan Lemon <jlemon@FreeBSD.org> and
     Matthew N. Dodd <mdodd@FreeBSD.org>.  This manual page was written by Tom
     Rhodes <trhodes@FreeBSD.org>.

FreeBSD 5.4			August 8, 2004			   FreeBSD 5.4

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