| dm-queue-length is a path selector module for device-mapper targets, |
| which selects a path with the least number of in-flight I/Os. |
| The path selector name is 'queue-length'. |
| Table parameters for each path: [<repeat_count>] |
| <repeat_count>: The number of I/Os to dispatch using the selected |
| path before switching to the next path. |
| If not given, internal default is used. To check |
| the default value, see the activated table. |
| Status for each path: <status> <fail-count> <in-flight> |
| <status>: 'A' if the path is active, 'F' if the path is failed. |
| <fail-count>: The number of path failures. |
| <in-flight>: The number of in-flight I/Os on the path. |
| dm-queue-length increments/decrements 'in-flight' when an I/O is |
| dispatched/completed respectively. |
| dm-queue-length selects a path with the minimum 'in-flight'. |
| In case that 2 paths (sda and sdb) are used with repeat_count == 128. |
| # echo "0 10 multipath 0 0 1 1 queue-length 0 2 1 8:0 128 8:16 128" \ |
| test: 0 10 multipath 0 0 1 1 queue-length 0 2 1 8:0 128 8:16 128 |
| test: 0 10 multipath 2 0 0 0 1 1 E 0 2 1 8:0 A 0 0 8:16 A 0 0 |