1*4882a593SmuzhiyunWhat: /sys/block/dm-<num>/dm/name 2*4882a593SmuzhiyunDate: January 2009 3*4882a593SmuzhiyunKernelVersion: 2.6.29 4*4882a593SmuzhiyunContact: dm-devel@redhat.com 5*4882a593SmuzhiyunDescription: Device-mapper device name. 6*4882a593Smuzhiyun Read-only string containing mapped device name. 7*4882a593SmuzhiyunUsers: util-linux, device-mapper udev rules 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunWhat: /sys/block/dm-<num>/dm/uuid 10*4882a593SmuzhiyunDate: January 2009 11*4882a593SmuzhiyunKernelVersion: 2.6.29 12*4882a593SmuzhiyunContact: dm-devel@redhat.com 13*4882a593SmuzhiyunDescription: Device-mapper device UUID. 14*4882a593Smuzhiyun Read-only string containing DM-UUID or empty string 15*4882a593Smuzhiyun if DM-UUID is not set. 16*4882a593SmuzhiyunUsers: util-linux, device-mapper udev rules 17*4882a593Smuzhiyun 18*4882a593SmuzhiyunWhat: /sys/block/dm-<num>/dm/suspended 19*4882a593SmuzhiyunDate: June 2009 20*4882a593SmuzhiyunKernelVersion: 2.6.31 21*4882a593SmuzhiyunContact: dm-devel@redhat.com 22*4882a593SmuzhiyunDescription: Device-mapper device suspend state. 23*4882a593Smuzhiyun Contains the value 1 while the device is suspended. 24*4882a593Smuzhiyun Otherwise it contains 0. Read-only attribute. 25*4882a593SmuzhiyunUsers: util-linux, device-mapper udev rules 26*4882a593Smuzhiyun 27*4882a593SmuzhiyunWhat: /sys/block/dm-<num>/dm/rq_based_seq_io_merge_deadline 28*4882a593SmuzhiyunDate: March 2015 29*4882a593SmuzhiyunKernelVersion: 4.1 30*4882a593SmuzhiyunContact: dm-devel@redhat.com 31*4882a593SmuzhiyunDescription: Allow control over how long a request that is a 32*4882a593Smuzhiyun reasonable merge candidate can be queued on the request 33*4882a593Smuzhiyun queue. The resolution of this deadline is in 34*4882a593Smuzhiyun microseconds (ranging from 1 to 100000 usecs). 35*4882a593Smuzhiyun Setting this attribute to 0 (the default) will disable 36*4882a593Smuzhiyun request-based DM's merge heuristic and associated extra 37*4882a593Smuzhiyun accounting. This attribute is not applicable to 38*4882a593Smuzhiyun bio-based DM devices so it will only ever report 0 for 39*4882a593Smuzhiyun them. 40*4882a593Smuzhiyun 41*4882a593SmuzhiyunWhat: /sys/block/dm-<num>/dm/use_blk_mq 42*4882a593SmuzhiyunDate: March 2015 43*4882a593SmuzhiyunKernelVersion: 4.1 44*4882a593SmuzhiyunContact: dm-devel@redhat.com 45*4882a593SmuzhiyunDescription: Request-based Device-mapper blk-mq I/O path mode. 46*4882a593Smuzhiyun Contains the value 1 if the device is using blk-mq. 47*4882a593Smuzhiyun Otherwise it contains 0. Read-only attribute. 48