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- What: /sys/block/dm-<num>/dm/name
- Date: January 2009
- KernelVersion: 2.6.29
- Contact: dm-devel@redhat.com
- Description: Device-mapper device name.
- Read-only string containing mapped device name.
- Users: util-linux, device-mapper udev rules
- What: /sys/block/dm-<num>/dm/uuid
- Date: January 2009
- KernelVersion: 2.6.29
- Contact: dm-devel@redhat.com
- Description: Device-mapper device UUID.
- Read-only string containing DM-UUID or empty string
- if DM-UUID is not set.
- Users: util-linux, device-mapper udev rules
- What: /sys/block/dm-<num>/dm/suspended
- Date: June 2009
- KernelVersion: 2.6.31
- Contact: dm-devel@redhat.com
- Description: Device-mapper device suspend state.
- Contains the value 1 while the device is suspended.
- Otherwise it contains 0. Read-only attribute.
- Users: util-linux, device-mapper udev rules
- What: /sys/block/dm-<num>/dm/rq_based_seq_io_merge_deadline
- Date: March 2015
- KernelVersion: 4.1
- Contact: dm-devel@redhat.com
- Description: Allow control over how long a request that is a
- reasonable merge candidate can be queued on the request
- queue. The resolution of this deadline is in
- microseconds (ranging from 1 to 100000 usecs).
- Setting this attribute to 0 (the default) will disable
- request-based DM's merge heuristic and associated extra
- accounting. This attribute is not applicable to
- bio-based DM devices so it will only ever report 0 for
- them.
- What: /sys/block/dm-<num>/dm/use_blk_mq
- Date: March 2015
- KernelVersion: 4.1
- Contact: dm-devel@redhat.com
- Description: Request-based Device-mapper blk-mq I/O path mode.
- Contains the value 1 if the device is using blk-mq.
- Otherwise it contains 0. Read-only attribute.
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