Foglight for Sybase 5.7.5.40 - User and Reference Guide

Disk I/O Dashboard

Disk I/O Dashboard

The Disk I/O dashboard provides performance details for read/write operations. This dashboard contains the following:

•	Device Spaces Tab

•	Device Activity Tab

•	Physical I/O for Devices Tab

Device Spaces Tab

Device Spaces Tab

Devices spaces information is provided in a table and a chart:

•	Device Spaces Table

•	Device I/O Summary Chart

Figure 24. Device Spaces Tab

Device Spaces Table

 

Table 35. Device Spaces Table Description

Name	Description
Logical Name	The logical name of the device.
Physical Name	The physical name of the device with directory path.
Space Total (MB)	The total memory space available to this device, in megabytes.
Space Allocated (MB)	The total memory space allocated to this device, in megabytes.
Space Allocated Percent	The percentage of device space allocated in the device space available.

Device I/O Summary Chart

 

Table 36. Device I/O Summary Chart Description

Name	Description
Device I/O Summary	The following three values, plotted over time: • Reads • APFs (Asynchronous Prefetch Activity) reads • Writes

Device Activity Tab

Device Activity Tab

Device activity information is provided in a table and a chart:

•	Device Activity Detail Table

•	Device I/O Summary Chart

Drill down by clicking on any device. A Sybase Disk I/O Detail chart appears.

Figure 25. Sybase Disk I/O Details chart

Device Activity Detail Table

 

Table 37. Device Activity Detail Table Description

Name	Description
Device Info
Logical Name	The logical name of the device.
Physical Name	The physical name of the device with directory path.
Last Sample
Writes	The number of writes for the selected time range.
Reads	The number of reads for the selected time range.
APF Reads	The number of APF (Asynchronous Prefetch Activity) reads for the selected time range.
Time Range Period:
Total I/O	The total number inputs and outputs for the selected time range. You can drill down by clicking on any field in this column. A popup appears showing the following three values, plotted over time: • Reads for this device. • APFs (Asynchronous Prefetch Activity) reads for this device. • Writes for this device.
Writes avg	The average number of writes for the selected time range.
Writes count	The number of writes for the selected time range.
Reads avg.	The average number of reads for the selected time range.
Reads count	The number of reads for the selected time range.
APF Reads avg.	The number of APF (Asynchronous Prefetch Activity) reads for the selected time range.
APF Reads count	The average number of APF (Asynchronous Prefetch Activity) reads for the selected time range.
IO/sec	The number of inputs and outputs per second.
Msec/IO	The number of milliseconds per input/output.

Device I/O Summary Chart

 

Table 38. Device I/O Summary Chart Description

Name	Description
Device I/O Summary	The following three values, plotted over time for all of the monitored devices: • Reads • APFs (Asynchronous Prefetch Activity) reads • Writes

Physical I/O for Devices Tab

Physical I/O for Devices Tab

Figure 26. Physical I/O for Devices Tab

Physical I/O for Devices Charts

 

Table 39. Physical I/O for Devices Charts Description

Name	Description
Physical Writes (All Devices)	The number of physical writes for each device, plotted over time.
Physical Reads (All Devices)	The number of physical reads for each device, plotted over time.