linux 6.0 (DM Multipath), path group how divided?
path_group divided on what basis?
path_grouping_policy ： Specifies the default path grouping policy to apply to unspecified multipaths.
”unspecified multipaths“ how to explain?
linux 6.0（DM Multipath），路径组 如何划分？
unspecified multipaths 如何解释？
Path groups are divided based upon path group policy.
|Path Grouping Policy|
|Determines how the path group(s) are formed using the available paths. There are five different policies:|
|1. multibus: One path group is formed with all paths to a LUN. Suitable for devices that are in Active/Active mode.|
|2. failover: Each path group will have only one path.|
|3. group_by_serial: One path group per storage controller(serial). All paths that connect to the LUN through a controller are assigned to a path group. Suitable for devices that are in Active/Passive mode.|
|4. group_by_prio: Paths with same priority will be assigned to a path group.|
|5. group_by_node_name: Paths with same target node name will be assigned to a path group.|
don't understand the unspecified multipath question, care to expound?