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