HP 3000 Manuals

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.


          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.


          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.


          Figure 5-22.  Disc Detail Screen--Summary and Top Disc Consumer 

MPE/iX 5.0 Documentation