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MFI(4) Device Drivers Manual MFI(4)

mfi — LSI MegaRAID SAS driver

To compile this driver into the kernel, place the following lines in your kernel configuration file:

device pci
device mfi

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

mfi_load="YES"

This driver is for LSI's next generation PCI Express SAS RAID controllers. Access to RAID arrays (logical disks) from this driver is provided via /dev/mfid? and access to JBOD disks is provided via /dev/mfisyspd? device nodes. A simple management interface is also provided on a per-controller basis via the /dev/mfi? device node.

The mfi name is derived from the phrase "MegaRAID Firmware Interface", which is substantially different than the old "MegaRAID" interface and thus requires a new driver.

Older SCSI and SATA MegaRAID cards are supported by amr(4) and will not work with this driver. Likewise, newer LSI MegaRAID SAS controllers are supported by mrsas(4) and will not work with this driver.

3 Gb/s and 6 Gb/s support both initiator target (IT) and integrated RAID (IR) firmware (see http://kb.lsi.com/KnowledgebaseArticle16266.aspx). The mfi driver supports controllers with an IR image. At least some cards (such as the IBM ServeRAID M1015) will attach to the mps(4) driver when IT firmware is used.

Two sysctls are provided to tune the mfi driver's behavior when a request is made to remove a mounted volume. By default the driver will disallow any requests to remove a mounted volume. If the sysctl dev.mfi.%d.delete_busy_volumes is set to 1, then the driver will allow mounted volumes to be removed. To not detach the mfid device for a busy volume that is deleted, set the sysctl dev.mfi.%d.keep_deleted_volumes to 1.

hw.mfi.msi.enable
By default, the driver will use MSI if it is supported. This behavior can be turned off by setting this tunable to 0.

The mfi driver supports the following hardware:

/dev/mfid?
array/logical disk interface
/dev/mfisyspd?
JBOD disk interface
/dev/mfi?
management interface

mfid%d: Unable to delete busy device
An attempt was made to remove a mounted volume.
mfisyspd%d: Unable to delete busy device
dito for JBOD disks

amr(4), mps(4), mrsas(4), pci(4), mfiutil(8)

The mfi driver first appeared in FreeBSD 6.1.

The mfi driver and this manual page were written by Scott Long <scottl@FreeBSD.org>.

November 28, 2014 DragonFly-5.6.1