MFI(4)                 FreeBSD Kernel Interfaces Manual                 MFI(4)

NAME
     mfi - LSI MegaRAID SAS driver

SYNOPSIS
     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"

DESCRIPTION
     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? 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.

     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.

     A tunable is provided to adjust the mfi driver's behaviour when attaching
     to a card.  By default the driver will attach to all known cards with
     high probe priority.  If the tunable hw.mfi.mrsas_enable is set to 1,
     then the driver will reduce its probe priority to allow mrsas to attach
     to the card instead of mfi.

     mfi does not provide ATA TRIM support.  Refer to mrsas if TRIM support is
     required.

HARDWARE
     The mfi driver supports the following hardware:

     •   LSI MegaRAID SAS 1078
     •   LSI MegaRAID SAS 8408E
     •   LSI MegaRAID SAS 8480E
     •   LSI MegaRAID SAS 9240
     •   LSI MegaRAID SAS 9260
     •   Dell PERC5
     •   Dell PERC6
     •   IBM ServeRAID M1015 SAS/SATA
     •   IBM ServeRAID M1115 SAS/SATA
     •   IBM ServeRAID M5015 SAS/SATA
     •   IBM ServeRAID M5110 SAS/SATA
     •   IBM ServeRAID-MR10i
     •   Intel RAID Controller SRCSAS18E
     •   Intel RAID Controller SROMBSAS18E

FILES
     /dev/mfid?      array/logical disk interface
     /dev/mfi?       management interface

DIAGNOSTICS
     mfid%d: Unable to delete busy device  An attempt was made to remove a
     mounted volume.

SEE ALSO
     amr(4), pci(4), mfiutil(8)

HISTORY
     The mfi driver first appeared in FreeBSD 6.1.

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

BUGS
     The driver does not support big-endian architectures at this time.

FreeBSD 13.1-RELEASE-p6         March 13, 2019         FreeBSD 13.1-RELEASE-p6