What: /sys/class/scsi_host/hostX/isci_id
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Date: June 2011
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Contact: Dave Jiang <dave.jiang@intel.com>
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Description:
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This file contains the enumerated host ID for the Intel
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SCU controller. The Intel(R) C600 Series Chipset SATA/SAS
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Storage Control Unit embeds up to two 4-port controllers in
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a single PCI device. The controllers are enumerated in order
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which usually means the lowest number scsi_host corresponds
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with the first controller, but this association is not
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guaranteed. The 'isci_id' attribute unambiguously identifies
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the controller index: '0' for the first controller,
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'1' for the second.
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What: /sys/class/scsi_host/hostX/acciopath_status
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Date: November 2013
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Contact: Stephen M. Cameron <scameron@beardog.cce.hp.com>
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Description: This file contains the current status of the "SSD Smart Path"
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feature of HP Smart Array RAID controllers using the hpsa
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driver. SSD Smart Path, when enabled permits the driver to
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send i/o requests directly to physical devices that are part
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of a logical drive, bypassing the controllers firmware RAID
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stack for a performance advantage when possible. A value of
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'1' indicates the feature is enabled, and the controller may
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use the direct i/o path to physical devices. A value of zero
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means the feature is disabled and the controller may not use
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the direct i/o path to physical devices. This setting is
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controller wide, affecting all configured logical drives on the
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controller. This file is readable and writable.
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What: /sys/class/scsi_host/hostX/link_power_management_policy
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Date: Oct, 2007
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KernelVersion: v2.6.24
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Contact: linux-ide@vger.kernel.org
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Description:
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(RW) This parameter allows the user to read and set the link
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(interface) power management.
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There are four possible options:
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min_power: Tell the controller to try to make the link use the
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least possible power when possible. This may sacrifice some
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performance due to increased latency when coming out of lower
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power states.
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max_performance: Generally, this means no power management.
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Tell the controller to have performance be a priority over power
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management.
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medium_power: Tell the controller to enter a lower power state
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when possible, but do not enter the lowest power state, thus
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improving latency over min_power setting.
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med_power_with_dipm: Identical to the existing medium_power
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setting except that it enables dipm (device initiated power
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management) on top, which makes it match the Windows IRST (Intel
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Rapid Storage Technology) driver settings. This setting is also
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close to min_power, except that:
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a) It does not use host-initiated slumber mode, but it does
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allow device-initiated slumber
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b) It does not enable low power device sleep mode (DevSlp).
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What: /sys/class/scsi_host/hostX/em_message
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What: /sys/class/scsi_host/hostX/em_message_type
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Date: Jun, 2008
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KernelVersion: v2.6.27
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Contact: linux-ide@vger.kernel.org
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Description:
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em_message: (RW) Enclosure management support. For the LED
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protocol, writes and reads correspond to the LED message format
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as defined in the AHCI spec.
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The user must turn sw_activity (under `/sys/block/*/device/`)
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OFF it they wish to control the activity LED via the em_message
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file.
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em_message_type: (RO) Displays the current enclosure management
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protocol that is being used by the driver (for eg. LED, SAF-TE,
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SES-2, SGPIO etc).
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What: /sys/class/scsi_host/hostX/ahci_port_cmd
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What: /sys/class/scsi_host/hostX/ahci_host_caps
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What: /sys/class/scsi_host/hostX/ahci_host_cap2
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Date: Mar, 2010
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KernelVersion: v2.6.35
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Contact: linux-ide@vger.kernel.org
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Description:
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[to be documented]
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What: /sys/class/scsi_host/hostX/ahci_host_version
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Date: Mar, 2010
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KernelVersion: v2.6.35
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Contact: linux-ide@vger.kernel.org
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Description:
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(RO) Display the version of the AHCI spec implemented by the
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host.
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What: /sys/class/scsi_host/hostX/em_buffer
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Date: Apr, 2010
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KernelVersion: v2.6.35
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Contact: linux-ide@vger.kernel.org
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Description:
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(RW) Allows access to AHCI EM (enclosure management) buffer
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directly if the host supports EM.
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For eg. the AHCI driver supports SGPIO EM messages but the
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SATA/AHCI specs do not define the SGPIO message format of the EM
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buffer. Different hardware(HW) vendors may have different
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definitions. With the em_buffer attribute, this issue can be
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solved by allowing HW vendors to provide userland drivers and
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tools for their SGPIO initiators.
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What: /sys/class/scsi_host/hostX/em_message_supported
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Date: Oct, 2009
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KernelVersion: v2.6.39
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Contact: linux-ide@vger.kernel.org
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Description:
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(RO) Displays supported enclosure management message types.
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