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CISS(4) Device Drivers Manual CISS(4)

cissCompaq Smart Array SAS/SATA/SCSI RAID controller

ciss* at pci?

The ciss driver provides support for Compaq Smart Array SAS/SATA/SCSI RAID controllers, including:

These controllers support RAID 0, RAID 1, RAID 5, JBOD, and superpositions of those configurations.

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

The ciss driver first appeared in OpenBSD 3.8.

The ciss driver was written by Michael Shalayeff <>.

For purposes of status monitoring, the current code only supports one logical volume per controller.

July 21, 2017 OpenBSD-6.4