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Based on kernel version 4.1. Page generated on 2015-06-28 12:07 EST.

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
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.
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.
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