| Milan Broz | 1d330ec | 2012-03-28 18:41:23 +0100 | [diff] [blame] | 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 |
| Mike Snitzer | 0ce6579 | 2015-02-26 00:50:28 -0500 | [diff] [blame] | 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. |
| Mike Snitzer | 17e149b | 2015-03-11 15:01:09 -0400 | [diff] [blame] | 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. |