18c2ecf20Sopenharmony_ciWhat: /sys/block/dm-<num>/dm/name 28c2ecf20Sopenharmony_ciDate: January 2009 38c2ecf20Sopenharmony_ciKernelVersion: 2.6.29 48c2ecf20Sopenharmony_ciContact: dm-devel@redhat.com 58c2ecf20Sopenharmony_ciDescription: Device-mapper device name. 68c2ecf20Sopenharmony_ci Read-only string containing mapped device name. 78c2ecf20Sopenharmony_ciUsers: util-linux, device-mapper udev rules 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ciWhat: /sys/block/dm-<num>/dm/uuid 108c2ecf20Sopenharmony_ciDate: January 2009 118c2ecf20Sopenharmony_ciKernelVersion: 2.6.29 128c2ecf20Sopenharmony_ciContact: dm-devel@redhat.com 138c2ecf20Sopenharmony_ciDescription: Device-mapper device UUID. 148c2ecf20Sopenharmony_ci Read-only string containing DM-UUID or empty string 158c2ecf20Sopenharmony_ci if DM-UUID is not set. 168c2ecf20Sopenharmony_ciUsers: util-linux, device-mapper udev rules 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ciWhat: /sys/block/dm-<num>/dm/suspended 198c2ecf20Sopenharmony_ciDate: June 2009 208c2ecf20Sopenharmony_ciKernelVersion: 2.6.31 218c2ecf20Sopenharmony_ciContact: dm-devel@redhat.com 228c2ecf20Sopenharmony_ciDescription: Device-mapper device suspend state. 238c2ecf20Sopenharmony_ci Contains the value 1 while the device is suspended. 248c2ecf20Sopenharmony_ci Otherwise it contains 0. Read-only attribute. 258c2ecf20Sopenharmony_ciUsers: util-linux, device-mapper udev rules 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ciWhat: /sys/block/dm-<num>/dm/rq_based_seq_io_merge_deadline 288c2ecf20Sopenharmony_ciDate: March 2015 298c2ecf20Sopenharmony_ciKernelVersion: 4.1 308c2ecf20Sopenharmony_ciContact: dm-devel@redhat.com 318c2ecf20Sopenharmony_ciDescription: Allow control over how long a request that is a 328c2ecf20Sopenharmony_ci reasonable merge candidate can be queued on the request 338c2ecf20Sopenharmony_ci queue. The resolution of this deadline is in 348c2ecf20Sopenharmony_ci microseconds (ranging from 1 to 100000 usecs). 358c2ecf20Sopenharmony_ci Setting this attribute to 0 (the default) will disable 368c2ecf20Sopenharmony_ci request-based DM's merge heuristic and associated extra 378c2ecf20Sopenharmony_ci accounting. This attribute is not applicable to 388c2ecf20Sopenharmony_ci bio-based DM devices so it will only ever report 0 for 398c2ecf20Sopenharmony_ci them. 408c2ecf20Sopenharmony_ci 418c2ecf20Sopenharmony_ciWhat: /sys/block/dm-<num>/dm/use_blk_mq 428c2ecf20Sopenharmony_ciDate: March 2015 438c2ecf20Sopenharmony_ciKernelVersion: 4.1 448c2ecf20Sopenharmony_ciContact: dm-devel@redhat.com 458c2ecf20Sopenharmony_ciDescription: Request-based Device-mapper blk-mq I/O path mode. 468c2ecf20Sopenharmony_ci Contains the value 1 if the device is using blk-mq. 478c2ecf20Sopenharmony_ci Otherwise it contains 0. Read-only attribute. 48