---
name: "aac"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["linux", "freebsd", "openbsd"]
url: "https://new.carta.tech/aac"
---

# aac(4)

Adaptec SAS/SATA/SCSI RAID controller

## NAME

**aac** – Adaptec SAS/SATA/SCSI RAID controller

## SYNOPSIS

**aac\* at pci?**

## DESCRIPTION

The **aac** driver provides support for Adaptec's "FSA" family of RAID controllers, including:

- Adaptec AAC-2622, AAC-364, AAC-3642

  - Adaptec 2130S, 2200S, 2230SLP, 2410SA, 2610SA, 2810SA, 21610SA

  - Dell CERC-SATA, PERC 320/DC

  - Dell PERC 2/QC, PERC 2/Si, PERC 3/Si, PERC 3/Di

  - HP NetRaid-4M

  - IBM ServeRAID-8i/8k/8s

  All the RAID set volume management is done via the card BIOS.

This driver makes drives and/or RAID sets appear as [sd(4)](/sd/4.md).

## SEE ALSO

[intro(4)](/intro/4.md), [scsi(4)](/scsi/4.md), [sd(4)](/sd/4.md)

## HISTORY

The **aac** driver first appeared in OpenBSD 2.9.

## AUTHORS

The **aac** driver was written by Niklas Hallqvist ⟨*niklas@openbsd.org*⟩, inspired by the FreeBSD driver by Mike Smith ⟨*msmith@freebsd.org*⟩.

## BUGS

The card provides a mechanism to do online RAID set management, unfortunately the protocol is not public.