PGQ
The Page Data Set I/O Queue (PGQ) sampler monitors the depth of I/Os queued to page data sets and produces a warning if the average I/O queue depth to any page data set exceeds a specified 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) |
depth | is the threshold average of I/Os queued to any page or swap data set |
Example
Assuming a report interval of 30 seconds, the following control statement displays warning messages at two-minute intervals if the average count of I/Os queued to any page-data set exceeds five:
PGQ 4,5
Warning message
The following warning message is issued by the PGQ sampler:
PWSPGQ03 *WARNING* I/O QUEUE DEPTH FOR PAGE DATA SET nn ON vvvvvv IS xx
where
Variable | Description |
|---|---|
nn | is the data set number |
vvvvvv | is the volume serial of device |
xx | is the I/O queue depth |