Performance and debugging

This section discusses performance tuning techniques and what should be done if a problem occurs that requires IBM® service assistance. The examples are for illustrative purposes only.

Start of changeIn releases prior to z/OS V2R2, it was typical for the 4-byte counters used in the reports to wrap. In z/OS V2R2, 8-byte counters are used, which allows for monitoring of much longer time periods. The numbers being output into the report fields still use the same field width sizes, with the addition of a letter to indicate the units of the number if it is too large to fit into the field. Start of change
Letter
Unit of number
Start of changebEnd of change
Start of changeThe number should be multiplied by 1,000,000,000.End of change
Start of changeGEnd of change
The number should be multiplied by 1,073,741,824.
t
The number should be multiplied by 1000.
Start of changeTEnd of change
Start of changeThe number should be multiplied by 1,099,511,627,776.End of change
Start of changetrEnd of change
Start of changeThe number should be multiplied by 1,000,000,000,000.End of change
m
The number should be multiplied by 1,000,000.
K
The number should be multiplied by 1024.
M
The number should be multiplied by 1,048,576.
End of change End of change
Parent topic: zFS administration guide