IDA(4) MidnightBSD Kernel Interfaces Manual IDA(4)


ida — Compaq Intelligent Drive Array Controllers


device scbus
device ida


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.


The following controllers are supported by the ida driver:

Compaq SMART Array 221

Compaq Integrated SMART Array Controller

Compaq SMART Array 4200

Compaq SMART Array 4250ES

Compaq SMART 3200 Controller

Compaq SMART 3100ES Controller

Compaq SMART-2/DH Controller

Compaq SMART-2/SL Controller

Compaq SMART-2/P Controller

Compaq SMART-2/E Controller

Compaq SMART Controller


Extreme caution should be exercised when using the pass-through interface. 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.


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


The ida driver was written by Jonathan Lemon 〈〉 and Matthew N. Dodd 〈〉. This manual page was written by Tom Rhodes 〈〉.

MidnightBSD 0.3 August 8, 2004 MidnightBSD 0.3