Commit | Line | Data |
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0a65e125 AP |
1 | What: /sys/block/*/device/sw_activity |
2 | Date: Jun, 2008 | |
3 | KernelVersion: v2.6.27 | |
4 | Contact: linux-ide@vger.kernel.org | |
5 | Description: | |
6 | (RW) Used by drivers which support software controlled activity | |
7 | LEDs. | |
8 | ||
9 | It has the following valid values: | |
10 | ||
34433332 | 11 | == ======================================================== |
0a65e125 AP |
12 | 0 OFF - the LED is not activated on activity |
13 | 1 BLINK_ON - the LED blinks on every 10ms when activity is | |
14 | detected. | |
15 | 2 BLINK_OFF - the LED is on when idle, and blinks off | |
16 | every 10ms when activity is detected. | |
34433332 | 17 | == ======================================================== |
0a65e125 AP |
18 | |
19 | Note that the user must turn sw_activity OFF it they wish to | |
20 | control the activity LED via the em_message file. | |
21 | ||
22 | ||
23 | What: /sys/block/*/device/unload_heads | |
24 | Date: Sep, 2008 | |
25 | KernelVersion: v2.6.28 | |
26 | Contact: linux-ide@vger.kernel.org | |
27 | Description: | |
28 | (RW) Hard disk shock protection | |
29 | ||
30 | Writing an integer value to this file will take the heads of the | |
31 | respective drive off the platter and block all I/O operations | |
32 | for the specified number of milliseconds. | |
33 | ||
34 | - If the device does not support the unload heads feature, | |
35 | access is denied with -EOPNOTSUPP. | |
36 | - The maximal value accepted for a timeout is 30000 | |
37 | milliseconds. | |
38 | - A previously set timeout can be cancelled and disk can resume | |
39 | normal operation immediately by specifying a timeout of 0. | |
40 | - Some hard drives only comply with an earlier version of the | |
41 | ATA standard, but support the unload feature nonetheless. | |
42 | There is no safe way Linux can detect these devices, so this | |
43 | is not enabled by default. If it is known that your device | |
44 | does support the unload feature, then you can tell the kernel | |
45 | to enable it by writing -1. It can be disabled again by | |
46 | writing -2. | |
47 | - Values below -2 are rejected with -EINVAL | |
48 | ||
49 | For more information, see | |
9e1cbede | 50 | Documentation/admin-guide/laptops/disk-shock-protection.rst |
0a65e125 AP |
51 | |
52 | ||
53 | What: /sys/block/*/device/ncq_prio_enable | |
54 | Date: Oct, 2016 | |
55 | KernelVersion: v4.10 | |
56 | Contact: linux-ide@vger.kernel.org | |
57 | Description: | |
5b8a2345 NC |
58 | (RW) Write to the file to turn on or off the SATA NCQ (native |
59 | command queueing) priority support. By default this feature is | |
60 | turned off. If the device does not support the SATA NCQ | |
f5975d18 DLM |
61 | priority feature, writing "1" to this file results in an error |
62 | (see ncq_prio_supported). | |
5b8a2345 NC |
63 | |
64 | ||
65 | What: /sys/block/*/device/sas_ncq_prio_enable | |
66 | Date: Oct, 2016 | |
67 | KernelVersion: v4.10 | |
68 | Contact: linux-ide@vger.kernel.org | |
69 | Description: | |
70 | (RW) This is the equivalent of the ncq_prio_enable attribute | |
71 | file for SATA devices connected to a SAS host-bus-adapter | |
72 | (HBA) implementing support for the SATA NCQ priority feature. | |
73 | This file does not exist if the HBA driver does not implement | |
74 | support for the SATA NCQ priority feature, regardless of the | |
f5975d18 DLM |
75 | device support for this feature (see sas_ncq_prio_supported). |
76 | ||
77 | ||
78 | What: /sys/block/*/device/ncq_prio_supported | |
79 | Date: Aug, 2021 | |
80 | KernelVersion: v5.15 | |
81 | Contact: linux-ide@vger.kernel.org | |
82 | Description: | |
83 | (RO) Indicates if the device supports the SATA NCQ (native | |
84 | command queueing) priority feature. | |
85 | ||
86 | ||
87 | What: /sys/block/*/device/sas_ncq_prio_supported | |
88 | Date: Aug, 2021 | |
89 | KernelVersion: v5.15 | |
90 | Contact: linux-ide@vger.kernel.org | |
91 | Description: | |
92 | (RO) This is the equivalent of the ncq_prio_supported attribute | |
93 | file for SATA devices connected to a SAS host-bus-adapter | |
94 | (HBA) implementing support for the SATA NCQ priority feature. | |
95 | This file does not exist if the HBA driver does not implement | |
96 | support for the SATA NCQ priority feature, regardless of the | |
5b8a2345 | 97 | device support for this feature. |
62488520 DLM |
98 | |
99 | ||
100 | What: /sys/block/*/device/cdl_supported | |
101 | Date: May, 2023 | |
102 | KernelVersion: v6.5 | |
103 | Contact: linux-scsi@vger.kernel.org | |
104 | Description: | |
105 | (RO) Indicates if the device supports the command duration | |
106 | limits feature found in some ATA and SCSI devices. |