admin-guide/device-mapper/dm-service-time.rst

2 dm-service-time
5 dm-service-time is a path selector module for device-mapper targets,
6 which selects a path with the shortest estimated service time for
9 The service time for each path is estimated by dividing the total size
14 The path selector name is 'service-time'.
49 dm-service-time adds the I/O size to 'in-flight-size' when the I/O is
51 Basically, dm-service-time selects a path having minimum service time
69 If such optimizations can't be applied, calculate service time, and
70 compare service time.
71 If calculated service time is equal, the path having maximum
82   # echo "0 10 multipath 0 0 1 1 service-time 0 2 2 8:0 128 1 8:16 128 4" \
86   test: 0 10 multipath 0 0 1 1 service-time 0 2 2 8:0 128 1 8:16 128 4
94   # echo "0 10 multipath 0 0 1 1 service-time 0 2 2 8:0 128 2 8:16 128 8" \
98   test: 0 10 multipath 0 0 1 1 service-time 0 2 2 8:0 128 2 8:16 128 8