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Linux/Documentation/admin-guide/device-mapper/dm-queue-length.rst

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Diff markup

Differences between /Documentation/admin-guide/device-mapper/dm-queue-length.rst (Version linux-6.12-rc7) and /Documentation/admin-guide/device-mapper/dm-queue-length.rst (Version linux-6.9.12)


  1 ===============                                     1 ===============
  2 dm-queue-length                                     2 dm-queue-length
  3 ===============                                     3 ===============
  4                                                     4 
  5 dm-queue-length is a path selector module for       5 dm-queue-length is a path selector module for device-mapper targets,
  6 which selects a path with the least number of       6 which selects a path with the least number of in-flight I/Os.
  7 The path selector name is 'queue-length'.           7 The path selector name is 'queue-length'.
  8                                                     8 
  9 Table parameters for each path: [<repeat_count      9 Table parameters for each path: [<repeat_count>]
 10                                                    10 
 11 ::                                                 11 ::
 12                                                    12 
 13         <repeat_count>: The number of I/Os to      13         <repeat_count>: The number of I/Os to dispatch using the selected
 14                         path before switching      14                         path before switching to the next path.
 15                         If not given, internal     15                         If not given, internal default is used. To check
 16                         the default value, see     16                         the default value, see the activated table.
 17                                                    17 
 18 Status for each path: <status> <fail-count> <i     18 Status for each path: <status> <fail-count> <in-flight>
 19                                                    19 
 20 ::                                                 20 ::
 21                                                    21 
 22         <status>: 'A' if the path is active, '     22         <status>: 'A' if the path is active, 'F' if the path is failed.
 23         <fail-count>: The number of path failu     23         <fail-count>: The number of path failures.
 24         <in-flight>: The number of in-flight I     24         <in-flight>: The number of in-flight I/Os on the path.
 25                                                    25 
 26                                                    26 
 27 Algorithm                                          27 Algorithm
 28 =========                                          28 =========
 29                                                    29 
 30 dm-queue-length increments/decrements 'in-flig     30 dm-queue-length increments/decrements 'in-flight' when an I/O is
 31 dispatched/completed respectively.                 31 dispatched/completed respectively.
 32 dm-queue-length selects a path with the minimu     32 dm-queue-length selects a path with the minimum 'in-flight'.
 33                                                    33 
 34                                                    34 
 35 Examples                                           35 Examples
 36 ========                                           36 ========
 37 In case that 2 paths (sda and sdb) are used wi     37 In case that 2 paths (sda and sdb) are used with repeat_count == 128.
 38                                                    38 
 39 ::                                                 39 ::
 40                                                    40 
 41   # echo "0 10 multipath 0 0 1 1 queue-length      41   # echo "0 10 multipath 0 0 1 1 queue-length 0 2 1 8:0 128 8:16 128" \
 42     dmsetup create test                            42     dmsetup create test
 43   #                                                43   #
 44   # dmsetup table                                  44   # dmsetup table
 45   test: 0 10 multipath 0 0 1 1 queue-length 0      45   test: 0 10 multipath 0 0 1 1 queue-length 0 2 1 8:0 128 8:16 128
 46   #                                                46   #
 47   # dmsetup status                                 47   # dmsetup status
 48   test: 0 10 multipath 2 0 0 0 1 1 E 0 2 1 8:0     48   test: 0 10 multipath 2 0 0 0 1 1 E 0 2 1 8:0 A 0 0 8:16 A 0 0
                                                      

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