TPDC Manual (G06.24+)

Using the SPAM Performance Data Charts and
Reports
Tandem Performance Data Collector (TPDC) Manual—526357-001
5-28
Disc I/Os per Second (DIOCHRT)
This 74-column chart displays disk process memory utilization within each CPU. The
chart includes:
•
CPU number
•
Total CPU memory pages
•
A flag if the volume is experiencing cache faults
•
Volume name
•
Percentage of a CPU’s memory used by the volume’s disk process, shown under
either the primary or backup column but not both.
A fairly significant proportion of a backup’s memory can be locked memory (undo
and redo chains).
•
A volume’s disk process group counters as a percentage of the sum of the
counters for all disk process groups within the CPU
•
Memory in use
•
Logical requests
•
System I/Os (cache hits plus physical I/Os, where writes to a mirrored volume are
counted as a single physical I/O)
•
Cache hits
•
Physical I/Os
This chart presents, in condensed form, data that is otherwise relatively tedious to
obtain.
This chart uses the GLOBINFO, CPU, and DISCINFO entities.
Parameters used are:
•
LID—specifies the Measure Load ID
•
SECTION—specifies the report section number
The chart is sorted by CPU number and memory utilized by disk process group within
each CPU.