Number Of I/O's For Batch Jobs - IBM PERFORMANCE MANAGEMENT FOR POWER SYSTEMS - GRAPH REFERENCE DOCUMENT Reference

Number of I/O's for Batch Jobs

Number of I/O's by Hour for Batch Jobs Graph.
An increase in the number of batch synchronous I/O over a time period can indicate that:

More batch work is being done

Work management settings of the partition are changed

An application has been changed
The Number of I/Os for Batch Jobs graph gives statistics about the I/O characteristics of an
average batch job. The I/O sections show both asynchronous I/O and synchronous I/O.
A batch job begins when a job becomes active from the job queue.
The Facts section of the graph displays the job characteristics for the current and previous two
months. It also shows the CPU time in seconds, the average number of I/Os, and the average
number of synchronous I/Os.
A transaction must wait for a synchronous disk I/O to complete before it can continue processing.
On the other hand, a transaction can continue processing when an asynchronous I/O is
requested. As a result, even the asynchronous I/O may affect the transaction response time.
Throughput can decrease over time if transactions require more synchronous I/O.
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