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MRSAS(4)               FreeBSD Kernel Interfaces Manual               MRSAS(4)

     mrsas - LSI MegaRAID 6Gb/s and 12Gb/s SAS+SATA RAID controller driver

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

           device pci
           device mrsas

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


     The mrsas driver will detect LSI's next generation (6Gb/s and 12Gb/s) PCI
     Express SAS/SATA RAID controllers.  See the HARDWARE section for the
     supported devices list.  A disk (virtual disk/physical disk) attached to
     the mrsas driver will be visible to the user through camcontrol(8) as
     /dev/da? device nodes.  A simple management interface is also provided on
     a per-controller basis via the /dev/mrsas? device node.

     The mrsas name is derived from the phrase "MegaRAID SAS HBA", which is
     substantially different than the old "MegaRAID" Driver mfi(4) which does
     not connect targets to the cam(4) layer and thus requires a new driver
     which attaches targets to the cam(4) layer.  Older MegaRAID controllers
     are supported by mfi(4) and will not work with mrsas, but both the mfi(4)
     and mrsas drivers can detect and manage the LSI MegaRAID SAS
     2208/2308/3008/3108 series of controllers.

     The device.hints(5) option is provided to tune the mrsas driver's
     behavior for LSI MegaRAID SAS 2208/2308/3008/3108 controllers.  By
     default, the mfi(4) driver will detect these controllers.  See the
     PRIORITY section to know more about driver priority for MR-Fusion

     mrsas will provide a priority of (-30) (between BUS_PROBE_DEFAULT and
     BUS_PROBE_LOW_PRIORITY) at probe call for device id's 0x005B, 0x005D, and
     0x005F so that mrsas does not take control of these devices without user

     The mrsas driver supports the following hardware:

     [ Thunderbolt 6Gb/s MR controller ]
        LSI MegaRAID SAS 9265
        LSI MegaRAID SAS 9266
        LSI MegaRAID SAS 9267
        LSI MegaRAID SAS 9270
        LSI MegaRAID SAS 9271
        LSI MegaRAID SAS 9272
        LSI MegaRAID SAS 9285
        LSI MegaRAID SAS 9286
        DELL PERC H810
        DELL PERC H710/P

     [ Invader/Fury 12Gb/s MR controller ]
        LSI MegaRAID SAS 9380
        LSI MegaRAID SAS 9361
        LSI MegaRAID SAS 9341
        DELL PERC H830
        DELL PERC H730/P
        DELL PERC H330

     To disable Online Controller Reset(OCR) for a specific mrsas driver
     instance, set the following tunable value in loader.conf(5):


     where X is the adapter number.

     To change the I/O timeout value for a specific mrsas driver instance, set
     the following tunable value in loader.conf(5):


     where NNNNNN is the timeout value in milli-seconds.

     To change the firmware fault check timer value for a specific mrsas
     driver instance, set the following tunable value in loader.conf(5):


     where NN is the fault check delay value in seconds.

     The current number of active I/O commands is shown in the
     dev.mrsas.X.fw_outstanding sysctl(8) variable.

     To enable debugging prints from the mrsas driver, set the
     hw.mrsas.X.debug_level variable, where X is the adapter number, either in
     loader.conf(5) or via sysctl(8).  The following bits have the described

           0x01    Enable informational prints.

           0x02    Enable tracing prints.

           0x04    Enable prints for driver faults.

           0x08    Enable prints for OCR and I/O timeout.

           0x10    Enable prints for AEN events.

     The mrsas driver will always set a default (-30) priority in the PCI
     subsystem for selection of MR-Fusion cards.  (It is between
     include all cards with the Device IDs - 0x005B, 0x005D, 0x005F.

     The mfi(4) driver will set a priority of either BUS_PROBE_DEFAULT or
     BUS_PROBE_LOW_PRIORITY (depending on the device.hints setting) in the PCI
     subsystem for selection of MR-Fusion cards.  With the above design in
     place, the mfi(4) driver will attach to a MR-Fusion card given that it
     has a higher priority than mrsas.

     Using /boot/device.hints (as mentioned below), the user can provide a
     preference for the mrsas driver to detect a MR-Fusion card instead of the
     mfi(4) driver.


     At boot time, the mfi(4) driver will get priority to detect MR-Fusion
     controllers by default.  Before changing this default driver selection
     policy, LSI advises users to understand how the driver selection policy
     works.  LSI's policy is to provide priority to the mfi(4) driver to
     detect MR-Fusion cards, but allow for the ability to choose the mrsas
     driver to detect MR-Fusion cards.

     LSI recommends setting hw.mfi.mrsas_enable="0" for customers who are
     using the older mfi(4) driver and do not want to switch to mrsas.  For
     those customers who are using a MR-Fusion controller for the first time,
     LSI recommends using the mrsas driver and setting

     Changing the default behavior is well tested under most conditions, but
     unexpected behavior may pop up if more complex and unrealistic operations
     are executed by switching between the mfi(4) and mrsas drivers for MR-
     Fusion.  Switching drivers is designed to happen only one time.  Although
     multiple switching is possible, it is not recommended.  The user should
     decide from Start of Day which driver they want to use for the MR-Fusion

     The user may see different device names when switching from mfi(4) to
     mrsas.  This behavior is Functions As Designed and the user needs to
     change the fstab(5) entry manually if they are doing any experiments with
     mfi(4) and mrsas interoperability.

     /dev/da?         array/logical disk interface
     /dev/mrsas?      management interface

     cam(4), mfi(4), pci(4), device.hints(5), camcontrol(8)

     The mrsas driver first appeared in FreeBSD 10.1.

     mfi Driver: mfi(4) is the old FreeBSD driver which started with support
     for Gen-1 Controllers and was extended to support up to MR-Fusion (Device
     ID = 0x005B, 0x005D, 0x005F).

     mrsas Driver: mrsas is the new driver reworked by LSI which supports
     Thunderbolt and onward products.  The SAS+SATA RAID controller with
     device id 0x005b is referred to as the Thunderbolt controller throughout
     this man page.

     cam aware HBA drivers: FreeBSD has a cam(4) layer which attaches storage
     devices and provides a common access mechanism to storage controllers and
     attached devices.  The mrsas driver is cam(4) aware and devices
     associated with mrsas can be seen using camcontrol(8).  The mfi(4) driver
     does not understand the cam(4) layer and it directly associates storage
     disks to the block layer.

     Thunderbolt Controller: This is the 6Gb/s MegaRAID HBA card which has
     device id 0x005B.

     Invader Controller: This is 12Gb/s MegaRAID HBA card which has device id

     Fury Controller: This is the 12Gb/s MegaRAID HBA card which has device id

     The mrsas driver and this manual page were written by Kashyap Desai
     <[email protected]>.

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

     The driver does not support alias for device name (it is required when
     the user switches between two drivers and does not want to edit
     /etc/fstab manually).

     The mrsas driver exposes devices as /dev/da?, whereas mfi(4) exposes
     devices as /dev/mfid?.

     mrsas does not support the Linux Emulator interface.

     mrsas will not work with mfiutil(8).

FreeBSD 11.1-RELEASE-p4           May 8, 2014          FreeBSD 11.1-RELEASE-p4
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