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1 | What: /sys/block/dm-<num>/dm/name |
2 | Date: January 2009 | |
3 | KernelVersion: 2.6.29 | |
4 | Contact: dm-devel@redhat.com | |
5 | Description: Device-mapper device name. | |
6 | Read-only string containing mapped device name. | |
7 | Users: util-linux, device-mapper udev rules | |
8 | ||
9 | What: /sys/block/dm-<num>/dm/uuid | |
10 | Date: January 2009 | |
11 | KernelVersion: 2.6.29 | |
12 | Contact: dm-devel@redhat.com | |
13 | Description: Device-mapper device UUID. | |
14 | Read-only string containing DM-UUID or empty string | |
15 | if DM-UUID is not set. | |
16 | Users: util-linux, device-mapper udev rules | |
17 | ||
18 | What: /sys/block/dm-<num>/dm/suspended | |
19 | Date: June 2009 | |
20 | KernelVersion: 2.6.31 | |
21 | Contact: dm-devel@redhat.com | |
22 | Description: Device-mapper device suspend state. | |
23 | Contains the value 1 while the device is suspended. | |
24 | Otherwise it contains 0. Read-only attribute. | |
25 | Users: util-linux, device-mapper udev rules | |
0ce65797 MS |
26 | |
27 | What: /sys/block/dm-<num>/dm/rq_based_seq_io_merge_deadline | |
28 | Date: March 2015 | |
29 | KernelVersion: 4.1 | |
30 | Contact: dm-devel@redhat.com | |
31 | Description: Allow control over how long a request that is a | |
32 | reasonable merge candidate can be queued on the request | |
33 | queue. The resolution of this deadline is in | |
34 | microseconds (ranging from 1 to 100000 usecs). | |
35 | Setting this attribute to 0 (the default) will disable | |
36 | request-based DM's merge heuristic and associated extra | |
37 | accounting. This attribute is not applicable to | |
38 | bio-based DM devices so it will only ever report 0 for | |
39 | them. | |
17e149b8 MS |
40 | |
41 | What: /sys/block/dm-<num>/dm/use_blk_mq | |
42 | Date: March 2015 | |
43 | KernelVersion: 4.1 | |
44 | Contact: dm-devel@redhat.com | |
45 | Description: Request-based Device-mapper blk-mq I/O path mode. | |
46 | Contains the value 1 if the device is using blk-mq. | |
47 | Otherwise it contains 0. Read-only attribute. |