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Diffstat (limited to 'Documentation/device-mapper/dm-queue-length.txt')
| -rw-r--r-- | Documentation/device-mapper/dm-queue-length.txt | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/Documentation/device-mapper/dm-queue-length.txt b/Documentation/device-mapper/dm-queue-length.txt deleted file mode 100644 index f4db2562175c..000000000000 --- a/Documentation/device-mapper/dm-queue-length.txt +++ /dev/null @@ -1,39 +0,0 @@ -dm-queue-length -=============== - -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. - - -Algorithm -========= - -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'. - - -Examples -======== -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" \ - dmsetup create test -# -# dmsetup table -test: 0 10 multipath 0 0 1 1 queue-length 0 2 1 8:0 128 8:16 128 -# -# dmsetup status -test: 0 10 multipath 2 0 0 0 1 1 E 0 2 1 8:0 A 0 0 8:16 A 0 0 |