119 lines
4.5 KiB
Plaintext
119 lines
4.5 KiB
Plaintext
What: /sys/class/scsi_host/hostX/isci_id
|
|
Date: June 2011
|
|
Contact: Dave Jiang <dave.jiang@intel.com>
|
|
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 <scameron@beardog.cce.hp.com>
|
|
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: linux-ide@vger.kernel.org
|
|
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: linux-ide@vger.kernel.org
|
|
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: linux-ide@vger.kernel.org
|
|
Description:
|
|
[to be documented]
|
|
|
|
What: /sys/class/scsi_host/hostX/ahci_host_version
|
|
Date: Mar, 2010
|
|
KernelVersion: v2.6.35
|
|
Contact: linux-ide@vger.kernel.org
|
|
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: linux-ide@vger.kernel.org
|
|
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: linux-ide@vger.kernel.org
|
|
Description:
|
|
(RO) Displays supported enclosure management message types.
|