Cache Page
The Memory | Cache page shows detailed information about system cache.
To open the Cache page
- Select the Spotlight connection in the Spotlight Browser.
-
Click Memory | Cache.
Charts on the Cache page
Notes:
- Every chart has a legend (list of symbols) to its right that describes the various series (line graphs) on the chart.
- Click an item in the legend to highlight its series (line) in the chart. Click a second time to return the series to its normal appearance.
- Move the mouse pointer over an item in the legend to view the current value for that series within the chart.
| Chart | Description |
|---|---|
| Cache Hit Rate |
Shows a recent summary of the percentage of file requests that are satisfied by the file cache, and that do not require a disk read. |
| Cache Size |
Shows the recent history of memory allocated to the file cache. Memory allocated to the file cache is dynamic. This is controlled by the Disk Cache Manager, and will alter the level of memory based upon how much physical memory is being used by other applications and is available in the system. |
| Physical Cache I/O | Shows the rate of Reads and Writes being made to the file cache. |
| Cache Faults |
This chart displays the number of faults that occur when a requested page is not found in the file system cache, and must be retrieved from elsewhere. The chart displays the number of faults, NOT the number of pages faulted in each operation. |
Disks Drilldown
Spotlight on Windows
Spotlight is a powerful diagnostic and problem-resolution tool for Windows operating systems. Its unique user interface provides you with an intuitive, visual representation of the activity on the host machine.
For information on Spotlight on Windows, see these sections
| Section |
Description |
|---|---|
| Background Information |
Introductory material to Spotlight on Windows. |
| Connect to a Windows System | Create / Modify / Delete connections to Windows systems. |
| Home Page | The Spotlight home page shows the flow of information and commands between various sub-components and the size and status of internal resources such as processes, disk files and memory structures. |
| Alarms |
Spotlight alerts you to problems with your system by issuing an alarm. You can configure Spotlight in the level of severity that constitutes an alarm, to disable an alarm, and the actions Spotlight takes on raising the alarm. |
| Drilldowns | When you have isolated a problem, you can display a drilldown page, whose charts and tables provide a detailed breakdown of the underlying statistics. |
| View | Options | Customize Spotlight. |
| Troubleshooting | Solve problems using Spotlight. |
For information on using Spotlight applications See
Logical Disk Activity Page
The Disks | Logical Disk Activity page shows information about the logical disks on this system. It includes I/O information, as well as disk space usage.
To open the Logical Disk Activity page
- Select the Spotlight connection in the Spotlight Browser.
-
Click Disks | Logical Disk Activity.
To view charts on the Logical Disk Activity page
Right-click the Logical Disk Activity page and select View as Chart.
Notes:
- Each disk is represented by a single line on the chart, and by an item in the legend at the right of the chart.
- Click an item in the legend to highlight its series (line) in the chart. Click a second time to return the series to its normal appearance.
- Move the mouse pointer over an item in the legend to view the current value for that series within the chart.
| Chart | Description |
|---|---|
| Disk Reads |
Shows a recent summary of the rate at which read requests have been sent to each logical disk. |
| Disk Writes |
Shows a recent summary of the rate at which write requests have been sent to each logical disk. |
| Disk I/O |
Shows a recent summary of the rate at which read and write requests have been sent to each logical disk. This chart is the sum of the Disk Reads and Disk Writes. |
| Disk Queue |
The Disk Queue chart shows the number of I/O requests that were queued for each logical disk. Disk queue length indicates how heavily loaded a disk subsystem is. High queue lengths mean the disks are struggling to process the I/O load being put on them. |
| Transfer Time |
The Transfer Time chart shows how long it is taking for data to be transferred between disk and memory, and includes both Disk Reads and Disk Writes. If disk transfers are taking consistently longer than 50 ms, a disk bottleneck may be developing. |
| Disk Load |
Shows how busy overall the individual logical disks are. |
To view the Logical Disk Activity page as a table
Right-click the Logical Disk Activity page and select View as Grid.
In table (grid) mode, the page displays the information contained in the charts, plus additional information in the following columns:
| Column | Description |
|---|---|
| KBs Read/s | The rate (in kilobytes/s) at which data is read from the specified logical disk. |
| KBs Written/s | The rate (in kilobytes/s) at which data is written to the specified logical disk. |
Physical Disk Activity Page
The Disks | Physical Disk Activity page shows information about the logical disks on this system. It includes I/O information, as well as disk space usage.
To open the Logical Disk Activity page
- Select the Spotlight connection in the Spotlight Browser.
-
Click Disks | Physical Disk Activity.
To view charts on the Physical Disk Activity page
Right-click the Physical Disk Activity page and select View as Chart.
Notes:
- Each disk is represented by a single line on the chart, and by an item in the legend at the right of the chart.
- Click an item in the legend to highlight its series (line) in the chart. Click a second time to return the series to its normal appearance.
- Move the mouse pointer over an item in the legend to view the current value for that series within the chart.
| Chart | Description |
|---|---|
| Disk Reads |
Shows a recent summary of the rate at which read requests have been sent to each physical disk. |
| Disk Writes |
Shows a recent summary of the rate at which write requests have been sent to each physical disk. |
| Disk I/O |
Shows a recent summary of the rate at which read and write requests have been sent to each physical disk. |
| Disk Queue |
The Disk Queue chart shows the number of I/O requests that were queued for each physical disk. Disk queue length indicates how heavily loaded a disk subsystem is. High queue lengths mean the disks are struggling to process the I/O load being put on them. |
| Transfer Time |
The Transfer Time chart shows how long it is taking for data to be transferred between disk and memory, and includes both Disk Reads and Disk Writes. If disk transfers are taking consistently longer than 50 ms, a disk bottleneck may be developing. |
| Disk Load |
Shows how busy overall the individual physical disks are. |
To view the Physical Disk Activity page as a table
Right-click the Physical Disk Activity page and select View as Grid.
In table (grid) mode, the page displays the information contained in the charts, plus additional information in the following columns:
| Column | Description |
|---|---|
| KBs Read per sec | The rate (in kilobytes/s) at which data is read from the specified physical disk. |
| KBs Written per sec | The rate (in kilobytes/s) at which data is written to the specified physical disk. |