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- What: /sys/block/*/device/sw_activity
- Date: Jun, 2008
- KernelVersion: v2.6.27
- Contact: [email protected]
- Description:
- (RW) Used by drivers which support software controlled activity
- LEDs.
- It has the following valid values:
- == ========================================================
- 0 OFF - the LED is not activated on activity
- 1 BLINK_ON - the LED blinks on every 10ms when activity is
- detected.
- 2 BLINK_OFF - the LED is on when idle, and blinks off
- every 10ms when activity is detected.
- == ========================================================
- Note that the user must turn sw_activity OFF it they wish to
- control the activity LED via the em_message file.
- What: /sys/block/*/device/unload_heads
- Date: Sep, 2008
- KernelVersion: v2.6.28
- Contact: [email protected]
- Description:
- (RW) Hard disk shock protection
- Writing an integer value to this file will take the heads of the
- respective drive off the platter and block all I/O operations
- for the specified number of milliseconds.
- - If the device does not support the unload heads feature,
- access is denied with -EOPNOTSUPP.
- - The maximal value accepted for a timeout is 30000
- milliseconds.
- - A previously set timeout can be cancelled and disk can resume
- normal operation immediately by specifying a timeout of 0.
- - Some hard drives only comply with an earlier version of the
- ATA standard, but support the unload feature nonetheless.
- There is no safe way Linux can detect these devices, so this
- is not enabled by default. If it is known that your device
- does support the unload feature, then you can tell the kernel
- to enable it by writing -1. It can be disabled again by
- writing -2.
- - Values below -2 are rejected with -EINVAL
- For more information, see
- Documentation/admin-guide/laptops/disk-shock-protection.rst
- What: /sys/block/*/device/ncq_prio_enable
- Date: Oct, 2016
- KernelVersion: v4.10
- Contact: [email protected]
- Description:
- (RW) Write to the file to turn on or off the SATA NCQ (native
- command queueing) priority support. By default this feature is
- turned off. If the device does not support the SATA NCQ
- priority feature, writing "1" to this file results in an error
- (see ncq_prio_supported).
- What: /sys/block/*/device/sas_ncq_prio_enable
- Date: Oct, 2016
- KernelVersion: v4.10
- Contact: [email protected]
- Description:
- (RW) This is the equivalent of the ncq_prio_enable attribute
- file for SATA devices connected to a SAS host-bus-adapter
- (HBA) implementing support for the SATA NCQ priority feature.
- This file does not exist if the HBA driver does not implement
- support for the SATA NCQ priority feature, regardless of the
- device support for this feature (see sas_ncq_prio_supported).
- What: /sys/block/*/device/ncq_prio_supported
- Date: Aug, 2021
- KernelVersion: v5.15
- Contact: [email protected]
- Description:
- (RO) Indicates if the device supports the SATA NCQ (native
- command queueing) priority feature.
- What: /sys/block/*/device/sas_ncq_prio_supported
- Date: Aug, 2021
- KernelVersion: v5.15
- Contact: [email protected]
- Description:
- (RO) This is the equivalent of the ncq_prio_supported attribute
- file for SATA devices connected to a SAS host-bus-adapter
- (HBA) implementing support for the SATA NCQ priority feature.
- This file does not exist if the HBA driver does not implement
- support for the SATA NCQ priority feature, regardless of the
- device support for this feature.
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