Defining threshold values for I/O priority MEDIUM and channels
IOPT_MED_CHN defines threshold values for channel utilization. As soon as the channel utilization by tasks with the priority HIGH reaches the threshold values, the proportion of tasks with the priority MEDIUM is restricted.
IOPT_MED_CHN |
IOPT_MED_CHN_1H=20 / <integer 0...100> IOPT_MED_CHN_2H=30 / <integer 0...100> IOPT_MED_CHN_3H=40 / <integer 0...100> IOPT_MED_CHN_1Q=50 / <integer 0...100> IOPT_MED_CHN_2Q=40 / <integer 0...100> IOPT_MED_CHN_3Q=30 / <integer 0...100> |
IOPT_MED_CHN_1H, IOPT_MED_CHN_2H, IOPT_MED_CHN_3H
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH.
IOPT_MED_CHN_1Q, IOPT_MED_CHN_2Q, IOPT_MED_CHN_3Q
Threshold values 1, 2 and 3 for tasks with the priority MEDIUM.
The threshold values have the following effects:
If utilization by tasks with the priority HIGH is less than IOPT_MED_CHN_1H, tasks with the priority MEDIUM are not restricted.
If utilization by tasks with the priority HIGH is between IOPT_MED_CHN_1H and IOPT_MED_CHN_2H, then IOPT_MED_CHN_1Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is between IOPT_MED_CHN_2H and IOPT_MED_CHN_3H, then IOPT_MED_CHN_2Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is greater than IOPT_MED_CHN_3H, then IOPT_MED_CHN_3Q restricts the proportion of tasks with the priority MEDIUM.
Defining threshold values for I/O priority MEDIUM and ports
IOPT_MED_POR defines threshold values for port utilization. As soon as the port utilization by tasks with the priority HIGH reaches the threshold values, the proportion of tasks with the priority MEDIUM is restricted by limits.
IOPT_MED_POR |
IOPT_MED_POR_1H=20 / <integer 0...100> IOPT_MED_POR_2H=30 / <integer 0...100> IOPT_MED_POR_3H=40 / <integer 0...100> IOPT_MED_POR_1Q=50 / <integer 0...100> IOPT_MED_POR_2Q=40 / <integer 0...100> IOPT_MED_POR_3Q=30 / <integer 0...100> |
IOPT_MED_POR_1H, IOPT_MED_POR_2H, IOPT_MED_POR_3H
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH.
IOPT_MED_POR_1Q, IOPT_MED_POR_2Q, IOPT_MED_POR_3Q
Threshold values 1, 2 and 3 for tasks with the priority MEDIUM.
The threshold values have the following effects:
If utilization by tasks with the priority HIGH is less than IOPT_MED_POR_1H, tasks with the priority MEDIUM are not restricted.
If utilization by tasks with the priority HIGH is between IOPT_MED_POR_1H and IOPT_MED_POR_2H, then IOPT_MED_POR_1Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is between IOPT_MED_POR_2H and IOPT_MED_POR_3H, then IOPT_MED_POR_2Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is between IOPT_MED_POR_3H, then IOPT_MED_POR_3Q restricts the proportion of tasks with the priority MEDIUM.
Defining threshold values for I/O priority MEDIUM and paths
IOPT_MED_PTH defines threshold values for path utilization. As soon as the path utilization by tasks with the priority HIGH reaches the threshold values, the proportion of tasks with the priority MEDIUM is restricted.
IOPT_MED_PTH |
IOPT_MED_PTH_1H=20 / <integer 0...100> IOPT_MED_PTH_2H=30 / <integer 0...100> IOPT_MED_PTH_3H=40 / <integer 0...100> IOPT_MED_PTH_1Q=50 / <integer 0...100> IOPT_MED_PTH_2Q=40 / <integer 0...100> IOPT_MED_PTH_3Q=30 / <integer 0...100> |
IOPT_MED_PTH_1H, IOPT_MED_PTH_2H, IOPT_MED_PTH_3H
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH.
IOPT_MED_PTH_1Q, IOPT_MED_PTH_2Q, IOPT_MED_PTH_3Q
Threshold values 1, 2 and 3 for tasks with the priority MEDIUM.
The threshold values have the following effects:
If utilization by tasks with the priority HIGH is less than IOPT_MED_PTH_1H, tasks with the priority MEDIUM are not restricted.
If utilization by tasks with the priority HIGH is between IOPT_MED_PTH_1H and IOPT_MED_PTH_2H, then IOPT_MED_PTH_1Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is between IOPT_MED_PTH_2H and IOPT_MED_PTH_3H, then IOPT_MED_PTH_2Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is greater than IOPT_MED_PTH_3H, then IOPT_MED_PTH_3Q restricts the proportion of tasks with the priority MEDIUM.
Defining threshold values for I/O priority MEDIUM and devices
IOPT_MED_DEV defines threshold values for device utilization. As soon as the device utilization by tasks with the priority HIGH reaches the threshold values, the proportion of tasks with the priority MEDIUM is restricted.
IOPT_MED_DEV |
IOPT_MED_DEV_1H=15 / <integer 0...100> IOPT_MED_DEV_2H=22 / <integer 0...100> IOPT_MED_DEV_3H=30 / <integer 0...100> IOPT_MED_DEV_1Q=50 / <integer 0...100> IOPT_MED_DEV_2Q=35 / <integer 0...100> IOPT_MED_DEV_3Q=25 / <integer 0...100> IOPT_MED_DEV_0S=70 / <integer 0...100> IOPT_MED_DEV_0H=1 / <integer 0...100> IOPT_MED_DEV_0R=25 / <integer 0...100> |
IOPT_MED_DEV_1H, IOPT_MED_DEV_2H, IOPT_MED_DEV_3H
Threshold values 1, 2 and 3 for utilization by tasks with the priority HIGH.
IOPT_MED_DEV_1Q, IOPT_MED_DEV_2Q, IOPT_MED_DEV_3Q
Threshold values 1, 2 and 3 for tasks with the priority MEDIUM.
IOPT_MED_DEV_0S, IOPT_MED_DEV_0H, IOPT_MED_DEV_0R
Threshold values for restricting the tasks with the priority MEDIUM in the event of high utilization of the device with, at the same time, relatively low utilization by tasks with the priority HIGH (i.e. IOPT_MED_DEV_1HM is not reached).
The threshold values have the following effects:
If utilization by tasks with the priority HIGH is less than IOPT_MED_DEV_1H, tasks with the priority MEDIUM are not restricted.
If utilization by tasks with the priority HIGH is between IOPT_MED_DEV_1H and IOPT_MED_DEV_2H, then IOPT_MED_DEV_1Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is between IOPT_MED_DEV_2H and IOPT_MED_DEV_3H, then IOPT_MED_DEV_2Q restricts the proportion of tasks with the priority MEDIUM.
If utilization by tasks with the priority HIGH is greater than IOPT_MED_DEV_3H, then IOPT_MED_DEV_3Q restricts the proportion of tasks with the priority MEDIUM.
Utilization by tasks with the priority MEDIUM is restricted by IOPT_MED_DEV_1Q even if the following conditions are satisfied:
Total utilization of a device exceeds the value IOPT_MED_DEV_0S
Total utilization by tasks with the priorities HIGH and MEDIUM exceeds the value IOPT_MED_DEV_0H
Ten times the average number of I/O requests for the device is greater than the value IOPT_MED_DEV_0R
If the utilization by tasks with the priority HIGH exceeds the value IOPT_MED_DEV_2H or IOPT_MED_DEV_3H, 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 does not increase significantly, the restriction is canceled again.