AMI(4)

💖 NAME 💖 — AMI(4): American Megatrends Inc. MegaRAID PATA/SATA/SCSI RAID controller

(Kernel Interfaces Manual, bestie — the ami driver is the main character here.) 🌸

This is the ami driver: American Megatrends Inc. MegaRAID PATA/SATA/SCSI RAID controller. It’s giving “fancy hardware, but make it Unix.” 💅

✨ SYNOPSIS ✨

ami* at pci?

🦋 DESCRIPTION 🦋

okay so the ami driver provides support for the MegaRAID family of RAID controllers, including:

• ACER — MegaRAID ROMB-2E
• Apple — Xserve G5 PCI Hardware RAID Card
• Dell — CERC-PATA, PERC 2/DC, PERC 2/SC, PERC 3/DC, PERC 3/DCL, PERC 3/QC, PERC 3/SC, PERC 4/DC, PERC 4/Di, PERC 4/SC, PERC 4e/DC, PERC 4e/Di, PERC 4e/SC, PERC 4e/Si
• FSC — MegaRAID PCI Express ROMB
• Hewlett-Packard — 438, 466, T[567]
• Intel — RAID Controller SRCS16, SRCS28X, SRCU41L, SRCU42E, SRCU42X, SROMBU42E, SRCZCRX
• LSI Logic/AMI/Symbios — MegaRAID, 523 SATA, i4 133 RAID, ATA 133-2 Elite 1400, Elite 1600, Elite 1650, Enterprise 1200, Enterprise 1300, Enterprise 1400, Enterprise 1500, Enterprise 1600, Express 100, Express 200, Express 300, Express 500, Series 418, SCSI 320-0, SCSI 320-0X, SCSI 320-1, SCSI 320-1E, SCSI 320-1LP, SCSI 320-2, SCSI 320-2E, SCSI 320-2X, SCSI 320-4X, SATA 150-4, SATA 150-6, SATA 300-4X, SATA 300-8ELP, SATA 300-8X, SATA 300-8XLP
• NEC — MegaRAID PCI Express ROMB

These controllers support RAID 0, RAID 1, RAID 5, JBOD, and superpositions of those configurations. Yes bestie, all of that. 🔥

no cap: even though the controllers are actual RAID controllers, the driver makes them look just like SCSI controllers. All RAID configuration is done through the controllers' BIOSes.

RAID management is done through the bio(4) device with the bioctl(8) command. Logical disk status is exposed under the hw.sensors sysctl(8) and can be monitored using sensorsd(8). For example:

$ sysctl hw.sensors.ami0
hw.sensors.ami0.drive0=online (sd0), OK
hw.sensors.ami0.drive1=degraded (sd1), WARNING
hw.sensors.ami0.drive2=failed (sd2), CRITICAL

🌈 SEE ALSO 🌈

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

🧚 HISTORY 🧚

The ami driver first appeared in OpenBSD 2.9. Iconic behavior. 👑

🎀 AUTHORS 🎀

• The ami driver was written by Michael Shalayeff <mickey@openbsd.org>.
• Management functions were implemented by Marco Peereboom <marco@openbsd.org>.

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This page is from Debian, dated February 19, 2022, and it’s the AMI(4) manual — byeeee! 🫶💖