Disc Detail Screen [ HP GlancePlus User's Manual (for MPE/iX Systems) ] MPE/iX 5.0 Documentation
HP GlancePlus User's Manual (for MPE/iX Systems)
Disc Detail Screen
Press the D command to see activity for the system disc drives as shown
on the Disc Detail screen. This screen lists performance information for
each drive currently active.
Click here to view figure.
Figure 5-20. Disc Detail Screen
The detailed data area of the display is divided into three parts:
* Individual Disc Utilization.
* Summary Disc Utilization.
* Top Disc Consumer.
Individual Disc Utilization
The individual disc utilization section of the screen displays one line
for each disc drive. Information is shown on the logical device number
(Ldev), percentage of utilization for the current interval, the average
service time (Service), physical read and write rates, current queue
depth, and maximum queue depth.
Click here to view figure.
Figure 5-21. Disc Detail Screen--Individual Disc Utilization
Utilization The utilization for each disc drive refers to
the percentage of time during the current
interval that the drive was in use servicing
reads and writes. It is computed by dividing
the disc's service time for the interval by the
interval's elapsed time. [Scale: 0% to 100%
utilization.]
Service The average service time for each physical I/O
appears in the Service field. Represented in
seconds, this metric is derived by dividing the
disc service time by the total number of
physical reads and writes for the current
interval. For example, "0. 0520" indicates an
average service time of 52 milliseconds for that
drive for the current interval.
Reads The number of physical reads per second for the
disc during the current interval appears to the
right of the Service field.
Writes The column showing the number of physical writes
per second for the disc during the current
interval appears to the right of the Reads
column.
Queue The Queue column lists the number of processes
in queue for this disc during the current time
interval.
Max Queue The Maximum Queue column shows the largest
number of processes in queue for this disc since
GlancePlus or the measurement interface was
started.
Summary Disc Utilization
The Summary Disc Utilization section shows the rate of logical reads and
writes per second, and the global memory manager reads and writes per
second. These rates are for the current interval. [Logical Attempt Bar
scale: 500 I/Os per second. Memory Manager scale: 100 I/Os per
second.]
Top Disc Consumer
The bottom section of the Disc Detail screen lists the highest disc
consumer for the current interval, identified by its process
identification number (PIN), the program name, and the physical I/O rate
for that PIN. If no disc activity occurred during the interval, the Top
Disc Consumer line will not appear on the screen. If you wish to analyze
that process in more detail, you can use the > command to take you to the
Process screen for that PIN.
Click here to view figure.
Figure 5-22. Disc Detail Screen--Summary and Top Disc Consumer
MPE/iX 5.0 Documentation
HP 3000 Manuals