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NAME
mps — LSI Fusion-MPT 2 IT/IR 6Gb/s Serial Attached SCSI/SATA driver
SYNOPSIS
To compile this driver into the kernel, place these lines in the kernel configuration file:
device pci
device scbus
device mps
The driver can be loaded as a module at boot time by placing this line in loader.conf(5):
mps_load="YES"
DESCRIPTION
The mps driver provides support for Broadcom Ltd./Avago Tech (LSI) Fusion-MPT 2 IT/IR SAS
controllers and WarpDrive solid state storage cards.
HARDWARE
These controllers are supported by the mps driver:
• Broadcom Ltd./Avago Tech (LSI) SAS 2004 (4 Port SAS)
• Broadcom Ltd./Avago Tech (LSI) SAS 2008 (8 Port SAS)
• Broadcom Ltd./Avago Tech (LSI) SAS 2108 (8 Port SAS)
• Broadcom Ltd./Avago Tech (LSI) SAS 2116 (16 Port SAS)
• Broadcom Ltd./Avago Tech (LSI) SAS 2208 (8 Port SAS)
• Broadcom Ltd./Avago Tech (LSI) SAS 2308 (8 Port SAS)
• Broadcom Ltd./Avago Tech (LSI) SSS6200 Solid State Storage
• Intel Integrated RAID Module RMS25JB040
• Intel Integrated RAID Module RMS25JB080
• Intel Integrated RAID Module RMS25KB040
• Intel Integrated RAID Module RMS25KB080
CONFIGURATION
In all tunable descriptions below, X represents the adapter number.
To disable MSI interrupts for all mps driver instances, set this tunable value in
loader.conf(5):
hw.mps.disable_msi=1
To disable MSI interrupts for a specific mps driver instance, set this tunable value in
loader.conf(5):
dev.mps.X.disable_msi=1
To disable MSI-X interrupts for all mps driver instances, set this tunable value in
loader.conf(5):
hw.mps.disable_msix=1
To disable MSI-X interrupts for a specific mps driver instance, set this tunable value in
loader.conf(5):
dev.mps.X.disable_msix=1
To set the maximum number of DMA chains allocated for all adapters, set this tunable in
loader.conf(5):
hw.mps.max_chains=NNNN
To set the maximum number of DMA chains allocated for a specific adapter, set this tunable
in loader.conf(5):
dev.mps.X.max_chains=NNNN
The default max_chains value is 2048.
The current number of free chain frames is stored in the dev.mps.X.chain_free sysctl(8)
variable.
The lowest number of free chain frames seen since boot is stored in the
dev.mps.X.chain_free_lowwater sysctl(8) variable.
The number of times that chain frame allocations have failed since boot is stored in the
dev.mps.X.chain_alloc_fail sysctl(8) variable. This can be used to determine whether the
max_chains tunable should be increased to help performance.
The current number of active I/O commands is shown in the dev.mps.X.io_cmds_active sysctl(8)
variable.
To set the maximum number of pages that will be used per I/O for all adapters, set this
tunable in loader.conf(5):
hw.mps.max_io_pages=NNNN
To set the maximum number of pages that will be used per I/O for a specific adapter, set
this tunable in loader.conf(5):
dev.mps.X.max_io_pages=NNNN
The default max_io_pages value is -1, meaning that the maximum I/O size that will be used
per I/O will be calculated using the IOCFacts values stored in the controller. The lowest
value that the driver will use for max_io_pages is 1, otherwise IOCFacts will be used to
calculate the maximum I/O size. The smaller I/O size calculated from either max_io_pages or
IOCFacts will be the maximum I/O size used by the driver.
The highest number of active I/O commands seen since boot is stored in the
dev.mps.X.io_cmds_highwater sysctl(8) variable.
Devices can be excluded from mps control for all adapters by setting this tunable in
loader.conf(5):
hw.mps.exclude_ids=Y
Y represents the target ID of the device. If more than one device is to be excluded, target
IDs are separated by commas.
Devices can be excluded from mps control for a specific adapter by setting this tunable in
loader.conf(5):
dev.mps.X.exclude_ids=Y
Y represents the target ID of the device. If more than one device is to be excluded, target
IDs are separated by commas.
The adapter can issue the StartStopUnit SCSI command to SATA direct-access devices during
shutdown. This allows the device to quiesce powering down. To control this feature for all
adapters, set the
hw.mps.enable_ssu
tunable in loader.conf(5) to one of these values:
0 Do not send SSU to either HDDs or SSDs.
1 Send SSU to SSDs, but not to HDDs. This is the default value.
2 Send SSU to HDDs, but not to SSDs.
3 Send SSU to both HDDs and SSDs.
To control this feature for a specific adapter, set this tunable value in loader.conf(5):
dev.mps.X.enable_ssu
The same set of values are valid as when setting this tunable for all adapters.
SATA disks that take several seconds to spin up and fail the SATA Identify command might not
be discovered by the driver. This problem can sometimes be overcome by increasing the value
of the spinup wait time in loader.conf(5) with the
hw.mps.spinup_wait_time=NNNN
tunable. NNNN represents the number of seconds to wait for SATA devices to spin up when the
device fails the initial SATA Identify command.
Spinup wait times can be set for specific adapters in loader.conf(5): with the
dev.mps.X.spinup_wait_time=NNNN
tunable. NNNN is the number of seconds to wait for SATA devices to spin up when they fail
the initial SATA Identify command.
The driver can map devices discovered by the adapter so that target IDs corresponding to a
specific device persist across resets and reboots. In some cases it is possible for devices
to lose their mapped IDs due to unexpected behavior from certain hardware, such as some
types of enclosures. To overcome this problem, a tunable is provided that will force the
driver to map devices using the Phy number associated with the device. This feature is not
recommended if the topology includes multiple enclosures/expanders. If multiple
enclosures/expanders are present in the topology, Phy numbers are repeated, causing all
devices at these Phy numbers except the first device to fail enumeration. To control this
feature for all adapters, set the
hw.mps.use_phy_num
tunable in loader.conf(5) to one of these values:
-1 Only use Phy numbers to map devices and bypass the driver's mapping logic.
0 Never use Phy numbers to map devices.
1 Use Phy numbers to map devices, but only if the driver's mapping logic fails
to map the device that is being enumerated. This is the default value.
To control this feature for a specific adapter, set this tunable value in loader.conf(5):
dev.mps.X.use_phy_num
The same set of values are valid as when setting this tunable for all adapters.
DEBUGGING
Driver diagnostic printing is controlled in loader.conf(5) by using the global
hw.mps.debug_level and per-device dev.mps.X.debug_level tunables. One can alter the debug
level for any adapter at run-time using the sysctl(8) variable dev.mps.X.debug_level.
All debug_level variables can be named by either an integer value or a text string.
Multiple values can be specified together by either ORing the integer values or by providing
a comma-separated list of names. A text string prefixed by "+" adds the specified debug
levels to the existing set, while the prefix "-" removes them from the existing set. The
current debug_level status is reported in both formats for convenience. The following
levels are available:
Flag Name Description
0x0001 info Basic information (enabled by default)
0x0002 fault Driver faults (enabled by default)
0x0004 event Controller events
0x0008 log Logging data from controller
0x0010 recovery Tracing of recovery operations
0x0020 error Parameter errors and programming bugs
0x0040 init System initialization operations
0x0080 xinfo More detailed information
0x0100 user Tracing of user-generated commands (IOCTL)
0x0200 mapping Tracing of device mapping
0x0400 trace Tracing through driver functions
SEE ALSO
cam(4), cd(4), ch(4), da(4), mpr(4), mpt(4), pci(4), sa(4), scsi(4), targ(4),
loader.conf(5), sysctl(8)
HISTORY
The mps driver first appeared in FreeBSD 9.0.
AUTHORS
The mps driver was originally written by Scott Long <scottl@FreeBSD.org>. It has been
improved and tested by LSI Corporation, Avago Technologies (formally LSI), and Broadcom Ltd.
(formally Avago).
This man page was written by Ken Merry <ken@FreeBSD.org> with additional input from Stephen
McConnell <slm@FreeBSD.org>.