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CAC(4) Device Drivers Manual CAC(4)

cacCompaq Smart Array 2/3/4 SCSI RAID controller

cac* at pci?
cac* at eisa?

The cac driver provides support for the following RAID controllers:

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

Although the controllers are actual RAID controllers the driver makes them look just like SCSI controllers. All RAID configuration is done through the controllers' BIOSes.

Monitoring status for the volume and drives in it is done through the bioctl(8) utility; the current status is provided by the sysctl(8) variable hw.sensors.

bio(4), eisa(4), intro(4), pci(4), scsi(4), sd(4), bioctl(8), sensorsd(8), sysctl(8)

The cac driver first appeared in OpenBSD 2.9.

The cac driver was written by Michael Shalayeff <>, inspired by the NetBSD driver by Andrew Doran <>.

April 18, 2015 OpenBSD-6.4