Viewing Reports and Logs : Viewing LUN I/O Reports
  
Viewing LUN I/O Reports
The LUN I/O report summarizes the standard I/O data traffic read from and written to the selected LUN for the specified period of time. Each SteelFusion Edge requires a dedicated LUN in the data center storage configuration. The LUN report contains the following table of statistics that summarize LUN I/O activity.
Data Series
Description
Read I/O Latency
Displays the total data read latency from the SteelFusion Core-side LUN(s).
Write I/O Latency
Displays the total data write latency to the SteelFusion Core-side LUN(s).
What This Report Tells You
The LUN I/O report answers the following questions:
•  How many megabytes have been written to and read from the selected LUN for the specified period?
•  How many operations have been written to and read from the selected LUN for the specified period?
•  What are the average read and write latencies for the selected LUN for the specified period?
About Report Data
The Riverbed system reports on performance for periods up to one month. Due to performance and disk space considerations, the display granularity decreases with time passed since the data was sampled.
About Report Graphs
Use the mouse to hover over a specific data point to see what the y values and exact timestamp were in relation to peaks.
To view the LUN I/O report
1. Choose Reports > SteelFusion Edge: LUN I/O to display the LUN I/O page.
Figure: The LUN I/O Page
2. Use the controls to customize the report as described in the following table.
 
Control
Description
Time Interval
Select a report time interval of 5 minutes (5m), 1 hour (1h), 1 day (1d), 1 week (1w), All, or type a custom date. All includes statistics for the last 30 days.
Time intervals that do not apply to a particular report are dimmed and unavailable.
For a custom time interval, enter the start time and end time using the format YYYY/MM/DD HH:MM:SS.
Because the system aggregates data on the hour, request hourly time intervals. For example, setting a time interval to 08:30:00 to 09:30:00 from 2 days ago does not create a data display, whereas setting a time interval to 08:00:00 to 09:00:00 from 2 days ago will display data.
When you request a custom time interval to view data beyond the aggregated granularity, the data is not visible because the system is no longer storing the data. For example, the following custom time intervals do not return data because the system automatically aggregates data older than 7 days into 2-hour data points:
•  Setting a 1-hour time period that occurred 2 weeks ago.
•  Setting a 75-minute time period that occurred more than 1 week ago.
You can quickly see the newest data and see data points as they are added to the chart dynamically. To display the newest data, click Show newest data.
LUN
Select the LUN whose statistics you want to see from the drop-down list or select All to view all LUNs.
LUN Report
Select I/O, I/O Operations Per Second, or I/O latency from the drop-down list.