Viewing SnapMirror Reports

The SnapMirror report displays how much benefit SnapMirror optimization is providing for a given filer (or all filers) and traffic type in the time period specified. You can use this report to view optimization outcomes for a filer, all volumes for a single filer, or a single filer for a volume or qtree. You can drill down to specific optimization statistics for a volume or a qtree.

Data Series	Description
Peak LAN/WAN Throughput	Displays the peak LAN/WAN data activity. The system stores peak statistics as bytes transferred over the LAN, but calculates the normal throughput using a granularity of 10 seconds.
Average LAN/WAN Throughput	Displays the average LAN/WAN data activity. The system stores non-peak statistics as the number of bytes transferred over the LAN/WAN, and calculates the throughput by converting bytes to bits and then dividing the result by the granularity. For instance, if the system reports 100 bytes for a data point with a 10-second granularity, RiOS calculates: 100 bytes * 8 bits/byte / 10 seconds = 80 bps This calculation means that 80 bps was the average throughput over that 10-second period. The total throughput shows the data amount transferred during the displayed time interval.
Data Reduction	Specifies the percentage of total decrease in overall data transmitted (when viewing all SnapMirror filers). The system calculates data reduction as (total LAN data - total WAN data) / total LAN data. You can use data reduction information to fine-tune the optimization settings for a filer, a filer and a volume, or a filer, volume, and qtree.

The Riverbed system reports for periods up to one month. Due to performance and disk space considerations, data representation in reports for periods longer than the latest five minutes are interpolated between data points obtained by aggregating multiple 10-second samples. The display granularity decreases with time passed since data was sampled. The data is collected at a 5-minute granularity for the entire month.

Figure: SnapMirror Page Displaying All Filers

Figure: SnapMirror Page for a Filer and Volume

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 don’t apply to a particular report are dimmed. For a custom time interval, enter the start time and end time using the format YYYY/MM/DD HH:MM:SS. You can view the newest data and see data points as they’re added to the chart dynamically. To display the newest data, click Show newest data.
Filer (Volume)	Select a filer, a filer and a volume, or a filer, volume, and qtree to view detailed statistics on that filer, along with volume and qtree information when applicable. Select all to view statistics on all filers. The SteelHead automatically identifies and summarizes information by filer, volume, and qtrees based on the SnapMirror traffic seen by the SteelHead. Peak lines appear after one hour for filer detail reports.
Traffic Type	Select either LAN or WAN to display the amount of data transmitted over the LAN/WAN during the selected time period.

When viewing all volumes for a single filer, the report stacks the throughput averages because the sum (total throughput of all volumes) is meaningful. It doesn’t stack the total peak. When there are more volumes than colors, the report reuses the colors, starting again from the beginning of the list.