TIO
The TSO I/O (TIO) sampler produces a warning whenever a specified TSO address space is detected that is using more than a specified percentage of the total system I/O activity in a reporting interval.
The message can be suppressed if a threshold for the total system I/O rate is not reached during a reporting interval. This sampler also notifies the operator when the I/O for a particular TSO address space exceeds the threshold.
Syntax
The parameters are defined as follows:
Parameter | Description |
|---|---|
int | is the length of the sample period in intervals; the default sample period is 30 seconds (one interval) |
percent | is the percentage of total system I/O for which a TSO address space must be responsible before an exception message is issued for that address space |
rptno | is the maximum number of TSO address spaces to be listed whenever a TSO I/O overload condition is detected; the default is 5 |
rate | is the rate of EXCPs per second that must be reached before exception messages are issued; the default is 25 |
Example
Assuming a report interval of 30 seconds, the following control statement displays up to eight warning messages (at two-minute intervals) for TSO address spaces that generated at least 5% of the I/O's during the interval, when the system I/O rate was at least 50 EXCPs-per-second:
TIO 4,5,8,50
A warning is issued for any TSO address space doing more than 25 percent of the I/O.
Warning message
The following warning message is issued by the TIO sampler:
PWSTIO01 *WARNING* I/O RATE FOR TSU nnnnnnnn IS xxx% OF SYSTEM TOTAL
Message PWSTIO01 indicates that the specified address space has exceeded the warning threshold for percentage of system I/O, where
Variable | Description |
|---|---|
nnnnnnnn | is the address space name |
xxx | is the percent of the total system I/O rate |
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