aac(4)

aac4

Adaptec sas/sata/scsi raid controller

Usage

aac* at pci?

Overview

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).

Releases

53 releases since OpenBSD 2.9; the text changed 12 times.

  1. 2.9
  2. 3.0–3.2
  3. 3.3
  4. 3.4–3.5
  5. 3.6
  6. 3.7–3.8
  7. 3.9
  8. 4.0
  9. 4.1
  10. 4.2–4.5
  11. 4.6–5.2
  12. 5.3
  13. 5.4–8.0

History

The aac driver first appeared in OpenBSD 2.9.

Authors

The aac driver was written by Niklas Hallqvist ⟨[email protected]⟩, inspired by the FreeBSD driver by Mike Smith ⟨[email protected]⟩.

Bugs

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

From man 8.0-current-20261101 in OpenBSD 8.0-current (2026-11-01). Parsed by carta from the page's mdoc source.