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