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Version: 361989 (ubuntu - 24/10/10)

Section: 4 (Pilotes et protocoles réseau)

BSD mandoc


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.conf5:



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 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 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.


The driver supports the following hardware:


array/logical disk interface
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 driver first appeared in Fx 6.1 .


The driver and this manual page were written by An Scott Long Aq .


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