Defining threshold values for I/O priority LOW and channels
IOPT_LOW_CHN defines threshold values for channel utilization. As soon as the channel utilization by tasks with the priorities HIGH and MEDIUM reaches the threshold values, the proportion of tasks with the priority LOW is restricted.
IOPT_LOW_CHN |
IOPT_LOW_CHN_1HM=20 / <integer 0...100> IOPT_LOW_CHN_2HM=30 / <integer 0...100> IOPT_LOW_CHN_3HM=40 / <integer 0...100> IOPT_LOW_CHN_1QH=40 / <integer 0...100> IOPT_LOW_CHN_2QH=30 / <integer 0...100> IOPT_LOW_CHN_3QH=20 / <integer 0...100> IOPT_LOW_CHN_1QM=55 / <integer 0...100> IOPT_LOW_CHN_2QM=40 / <integer 0...100> IOPT_LOW_CHN_3QM=30 / <integer 0...100> |
IOPT_LOW_CHN_1HM, IOPT_LOW_CHN_2HM, IOPT_LOW_CHN_3HM
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH or MEDIUM.
IOPT_LOW_CHN_1QH, IOPT_LOW_CHN_2QH, IOPT_LOW_CHN_3QH
Threshold values 1, 2 and 3 for tasks with the priority LOW in the event of a high proportion of tasks with the priority HIGH.
IOPT_LOW_CHN_1QM, IOPT_LOW_CHN_2QM, IOPT_LOW_CHN_3QM
Threshold values1, 2 and 3 for tasks with the priority LOW in the event of a low proportion of tasks with the priority HIGH.
The threshold values have the following effects:
If utilization by tasks with the priority HIGH or MEDIUM is less than IOPT_LOW_CHN_1HM, the tasks with the priority LOW are not restricted.
If utilization by tasks with the priority HIGH or MEDIUM is between IOPT_LOW_CHN_1HM and IOPT_LOW_CHN_2HM, then IOPT_LOW_CHN_1QH or IOPT_LOW_CHN_1QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_CHN_1QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_CHN_1QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is between IOPT_LOW_CHN_2HM and IOPT_LOW_CHN_3HM, then IOPT_LOW_CHN_2QH or IOPT_LOW_CHN_2QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_CHN_2QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_CHN_2QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is greater than IOPT_LOW_CHN_3HM, then IOPT_LOW_CHN_3QH or IOPT_LOW_CHN_3QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_CHN_3QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_CHN_3QM if the proportion of tasks with the priority HIGH is low
Defining threshold values for I/O priority LOW and ports
IOPT_LOW_POR defines threshold values for port utilization. As soon as the port utilization by tasks with the priorities HIGH and MEDIUM reaches the threshold values, the proportion of tasks with the priority LOW is restricted.
IOPT_LOW_POR |
IOPT_LOW_POR_1HM=20 / <integer 0...100> IOPT_LOW_POR_2HM=30 / <integer 0...100> IOPT_LOW_POR_3HM=40 / <integer 0...100> IOPT_LOW_POR_1QH=40 / <integer 0...100> IOPT_LOW_POR_2QH=30 / <integer 0...100> IOPT_LOW_POR_3QH=20 / <integer 0...100> IOPT_LOW_POR_1QM=55 / <integer 0...100> IOPT_LOW_POR_2QM=40 / <integer 0...100> IOPT_LOW_POR_3QM=30 / <integer 0...100> |
IOPT_LOW_POR_1HM, IOPT_LOW_POR_2HM, IOPT_LOW_POR_3HM
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH or MEDIUM.
IOPT_LOW_POR_1QH, IOPT_LOW_POR_2QH, IOPT_LOW_POR_3QH
Threshold values 1, 2 and 3 for tasks with the priority LOW in the event of a high proportion of tasks with the priority HIGH.
IOPT_LOW_POR_1QM, IOPT_LOW_POR_2QM, IOPT_LOW_POR_3QM
Threshold values 1, 2 and 3 for tasks with the priority LOW in the event of a low proportion of tasks with the priority HIGH.
The threshold values have the following effects:
If utilization by tasks with the priority HIGH or MEDIUM is less than IOPT_LOW_POR_1HM, the tasks with the priority LOW are not restricted.
If utilization by tasks with the priority HIGH or MEDIUM is between IOPT_LOW_POR_1HM and IOPT_LOW_POR_2HM, then IOPT_LOW_POR_1QH or IOPT_LOW_POR_1QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_POR_1QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_POR_1QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is between
IOPT_LOW_POR_2HM and IOPT_LOW_POR_3HM, then IOPT_LOW_POR_2QH or IOPT_LOW_POR_2QM restricts the proportion of tasks with the priority LOW:IOPT_LOW_POR_2QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_POR_2QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is greater than IOPT_LOW_POR_3HM, then IOPT_LOW_POR_3QH or IOPT_LOW_POR_3QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_POR_3QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_POR_3QM if the proportion of tasks with the priority HIGH is low
Defining threshold values for I/O priority LOW and paths
IOPT_LOW_PTH defines threshold values for path utilization. As soon as the path utilization by tasks with the priorities HIGH and MEDIUM reaches the threshold values, the proportion of tasks with the priority LOW is restricted.
IOPT_LOW_PTH |
IOPT_LOW_PTH_1HM=20 / <integer 0...100> IOPT_LOW_PTH_2HM=30 / <integer 0...100> IOPT_LOW_PTH_3HM=40 / <integer 0...100> IOPT_LOW_PTH_1QH=40 / <integer 0...100> IOPT_LOW_PTH_2QH=30 / <integer 0...100> IOPT_LOW_PTH_3QH=20 / <integer 0...100> IOPT_LOW_PTH_1QM=55 / <integer 0...100> IOPT_LOW_PTH_2QM=40 / <integer 0...100> IOPT_LOW_PTH_3QM=30 / <integer 0...100> |
IOPT_LOW_PTH_1HM, IOPT_LOW_PTH_2HM, IOPT_LOW_PTH_3HM
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH or MEDIUM.
IOPT_LOW_PTH_1QH, IOPT_LOW_PTH_2QH, IOPT_LOW_PTH_3QH
Threshold values 1, 2 and 3 for tasks with the priority LOW in the event of a high proportion of tasks with the priority HIGH.
IOPT_LOW_PTH_1QM, IOPT_LOW_PTH_2QM, IOPT_LOW_PTH_3QM
Threshold values 1, 2 and 3 for tasks with the priority LOW in the event of a low proportion of tasks with the priority HIGH.
The threshold values have the following effects:
If utilization by tasks with the priority HIGH or MEDIUM is less than IOPT_LOW_PTH_1HM, the tasks with the priority LOW are not restricted.
If utilization by tasks with the priority HIGH or MEDIUM is between IOPT_LOW_PTH_1HM and IOPT_LOW_PTH_2HM, then IOPT_LOW_PTH_1QH or IOPT_LOW_PTH_1QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_PTH_1QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_PTH_1QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is between IOPT_LOW_PTH_2HM and IOPT_LOW_PTH_3HM, then IOPT_LOW_PTH_2QH or IOPT_LOW_PTH_2QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_PTH_2QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_PTH_2QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is greater than IOPT_LOW_PTH_3HM, then IOPT_LOW_PTH_3QH or IOPT_LOW_PTH_3QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_PTH_3QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_PTH_3QM if the proportion of tasks with the priority HIGH is low
Defining threshold values for I/O priority LOW and devices
IOPT_LOW_DEV defines threshold values for device utilization. As soon as the device utilization by tasks with the priorities HIGH and MEDIUM reaches the threshold values, the proportion of tasks with the priority LOW is restricted.
IOPT_LOW_DEV |
IOPT_LOW_DEV_1HM=15 / <integer 0...100> IOPT_LOW_DEV_2HM=22 / <integer 0...100> IOPT_LOW_DEV_3HM=30 / <integer 0...100> IOPT_LOW_DEV_1QH=35 / <integer 0...100> IOPT_LOW_DEV_2QH=25 / <integer 0...100> IOPT_LOW_DEV_3QH=10 / <integer 0...100> IOPT_LOW_DEV_1QM=50 / <integer 0...100> IOPT_LOW_DEV_2QM=40 / <integer 0...100> IOPT_LOW_DEV_3QM=30 / <integer 0...100> IOPT_LOW_DEV_0SU=70 / <integer 0...100> IOPT_LOW_DEV_0HM=1 / <integer 0...100> IOPT_LOW_DEV_0RQ=25 / <integer 0...100> |
IOPT_LOW_DEV_1HM, IOPT_LOW_DEV_2HM, IOPT_LOW_DEV_3HM
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH or MEDIUM.
IOPT_LOW_DEV_1QH, IOPT_LOW_DEV_2QH, IOPT_LOW_DEV_3QH
Threshold values 1, 2 and 3 for tasks with the priority LOW in the event of a high proportion of tasks with the priority HIGH.
IOPT_LOW_DEV_1QM, IOPT_LOW_DEV_2QM, IOPT_LOW_DEV_3QM
Threshold values 1, 2 and 3 for tasks with the priority LOW in the event of a low proportion of tasks with the priority HIGH.
IOPT_LOW_DEV_0SU, IOPT_LOW_DEV_0HM, IOPT_LOW_DEV_0RQ
Threshold values for restricting the tasks with the priority LOW in the event of high utilization of the device with, at the same time, relatively low utilization by tasks with the priority HIGH or MEDIUM (i.e. IOPT_LOW_DEV_1HM is not reached).
The threshold values have the following effects:
If utilization by tasks with the priority HIGH or MEDIUM is less than IOPT_LOW_DEV_1HM, the tasks with the priority LOW are not restricted.
If utilization by tasks with the priority HIGH or MEDIUM is between IOPT_LOW_DEV_1HM and IOPT_LOW_DEV_2HM, then IOPT_LOW_DEV_1QH or IOPT_LOW_DEV_1QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_DEV_1QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_DEV_1QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is between IOPT_LOW_DEV_2HM and IOPT_LOW_DEV_3HM, then IOPT_LOW_DEV_2QH or IOPT_LOW_DEV_2QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_DEV_2QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_DEV_2QM if the proportion of tasks with the priority HIGH is low
If utilization by tasks with the priority HIGH or MEDIUM is greater than IOPT_LOW_DEV_3HM, then IOPT_LOW_DEV_3QH or IOPT_LOW_DEV_3QM restricts the proportion of tasks with the priority LOW:
IOPT_LOW_DEV_3QH if the proportion of tasks with the priority HIGH is high
IOPT_LOW_DEV_3QM if the proportion of tasks with the priority HIGH is low
Utilization by tasks with the priority LOW is restricted by IOPT_LOW_DEV_1QH or IOPT_LOW_DEV_1QM even if the following conditions are satisfied:
Total utilization of a device exceeds the value IOPT_LOW_DEV_0SU
Total utilization by tasks with the priorities HIGH and MEDIUM exceeds the value IOPT_LOW_DEV_0HM
Ten times the average number of I/O requests for the device is greater than the value IOPT_LOW_DEV_0RQ
If the utilization by tasks with the priority HIGH exceeds the value IOPT_LOW_DEV_2HM or IOPT_LOW_DEV_3HM, the restrictions defined for these threshold values apply.
If, despite considerably lower total utilization after a restriction has been introduced, the utilization by tasks with the priority HIGH or MEDIUM does not increase significantly, the restriction is canceled again.