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