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     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



     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

     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

     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.


     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


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


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


     amr(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 <>.


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