> # N3K Buffer Usage

> You can view the performance of the N3K buffer usage and the total number of bursts during a specific time.

> 1. From the menu bar, choose Performance > N3K Buffer Usage

> You see the N3K Buffer Usage window which displays the average number of burst per hour, maximum number of burst per hour and the total number of burst per hour.

> 2. To export the data into a spreadsheet, click the Export to Excel icon in the upper-right corner and then click Save.
> 3. Click the chart icon in the Name column to see:
> 4. A bar chart of the hourly based burst number for the selected interface.
> 5. Clicking each item in the bar chart will open a detailed buffer burst window for the selected hour.

> Note If the performance tables do not contain any data, see the Performance Manager Collections section to turn on performance data collection.

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