| MFII(4) | Device Drivers Manual | MFII(4) | 
mfii —
mfii* at pci?
mfii driver provides support for the MegaRAID SAS
  Fusion family of RAID controllers using the following chipsets:
These controllers support RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50 and RAID 60 using either SAS or SATA II drives.
Although the controllers are actual RAID controllers, they appear as SCSI controllers. All RAID configuration is done through the controllers' BIOSes.
mfii supports monitoring of the logical
    disks in the controller through the
    bioctl(8) and
    envstat(8) commands.
mfii driver is able to send events to
  powerd(8) if a logical drive in
  the controller is not online. The state-changed event will
  be sent to the /etc/powerd/scripts/sensor_drive script
  when such condition happens.
mfii driver first appeared in
  OpenBSD 5.3 and NetBSD 8.0.
mfii driver was written by David
  Gwynne
  <dlg@openbsd.org>.
| July 16, 2022 | NetBSD 10.0 |