1 What: /sys/block/*/device/sw_activit
2 Date: Jun, 2008
3 KernelVersion: v2.6.27
4 Contact: linux-ide@vger.kernel.org
5 Description:
6 (RW) Used by drivers which sup
7 LEDs.
8
9 It has the following valid val
10
11 == ======================
12 0 OFF - the LED is not a
13 1 BLINK_ON - the LED bli
14 detected.
15 2 BLINK_OFF - the LED is
16 every 10ms when activi
17 == ======================
18
19 Note that the user must turn s
20 control the activity LED via t
21
22
23 What: /sys/block/*/device/unload_hea
24 Date: Sep, 2008
25 KernelVersion: v2.6.28
26 Contact: linux-ide@vger.kernel.org
27 Description:
28 (RW) Hard disk shock protectio
29
30 Writing an integer value to th
31 respective drive off the platt
32 for the specified number of mi
33
34 - If the device does not suppo
35 access is denied with -EOPNO
36 - The maximal value accepted f
37 milliseconds.
38 - A previously set timeout can
39 normal operation immediately
40 - Some hard drives only comply
41 ATA standard, but support th
42 There is no safe way Linux c
43 is not enabled by default. I
44 does support the unload feat
45 to enable it by writing -1.
46 writing -2.
47 - Values below -2 are rejected
48
49 For more information, see
50 Documentation/admin-guide/lapt
51
52
53 What: /sys/block/*/device/ncq_prio_e
54 Date: Oct, 2016
55 KernelVersion: v4.10
56 Contact: linux-ide@vger.kernel.org
57 Description:
58 (RW) Write to the file to turn
59 command queueing) priority sup
60 turned off. If the device does
61 priority feature, writing "1"
62 (see ncq_prio_supported).
63
64
65 What: /sys/block/*/device/sas_ncq_pr
66 Date: Oct, 2016
67 KernelVersion: v4.10
68 Contact: linux-ide@vger.kernel.org
69 Description:
70 (RW) This is the equivalent of
71 file for SATA devices connecte
72 (HBA) implementing support for
73 This file does not exist if th
74 support for the SATA NCQ prior
75 device support for this featur
76
77
78 What: /sys/block/*/device/ncq_prio_s
79 Date: Aug, 2021
80 KernelVersion: v5.15
81 Contact: linux-ide@vger.kernel.org
82 Description:
83 (RO) Indicates if the device s
84 command queueing) priority fea
85
86
87 What: /sys/block/*/device/sas_ncq_pr
88 Date: Aug, 2021
89 KernelVersion: v5.15
90 Contact: linux-ide@vger.kernel.org
91 Description:
92 (RO) This is the equivalent of
93 file for SATA devices connecte
94 (HBA) implementing support for
95 This file does not exist if th
96 support for the SATA NCQ prior
97 device support for this featur
98
99
100 What: /sys/block/*/device/cdl_suppor
101 Date: May, 2023
102 KernelVersion: v6.5
103 Contact: linux-scsi@vger.kernel.org
104 Description:
105 (RO) Indicates if the device s
106 limits feature found in some A
107
108
109 What: /sys/block/*/device/cdl_enable
110 Date: May, 2023
111 KernelVersion: v6.5
112 Contact: linux-scsi@vger.kernel.org
113 Description:
114 (RW) For a device supporting t
115 feature, write to the file to
116 By default this feature is tur
117 Writing "1" to this file enabl
118 limits for read and write comm
119 the feature on the device. Wri
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