> # Configuring the RRD Database

> Configuring the Round Robin Database (RRD) allows you to set the intervals at which data samples are collected. After applying the configuration, the database storage format is converted to a new format at those intervals. Because database formats are incompatible with each other, you must copy the old data (before the conversion) to the $INSTALLDIR/pm directory. See the "Importing the RRD Statistics Index" topic.

> 1. From the menu bar, choose Admin > Performance > Databases.

> You see the Performance Database (collection interval) page.

> 2. In the top row of the Days column, enter the number of days to collect samples at 5-minute intervals.
> 3. In the second row of the Days column, enter the number of days to collect samples at 30-minute intervals.
> 4. In the third row of the Days column, enter the number of days to collect samples at 2-hour intervals.
> 5. In the bottom row of the Days column, enter the number of days to collect samples at 1-day intervals.

> As of Cisco SAN-OS Release 3.1(1) and later releases, you can configure the sampling interval for ISLs. Select a sampling interval from the ISLs drop-down list.

> 1. Click Apply to apply your changes, or click Defaults to reset the file sizes to the default values.

> If you are applying new values, or if the current values are not the default values, you see a message indicating that the conversion of the RRD files take a certain amount of time and that the database is unavailable until then. The time it takes depends on the difference between the old and new values.

> Note The system allows you to convert data, one process at a time. When you start converting the data, the Apply and Default buttons change to Refresh and Cancel so that another process cannot be inadvertently started. The display is the same for all browsers that access the server during this time. Click Refresh to view the latest progress. Click Cancel to cancel the process of converting the data. If the job is successfully canceled, you see the Apply and Default buttons again. If the cancel job is not successful, you see a message indicating that the cancellation has failed.

> If you want to perform this procedure, perform it before collecting a lot of data because data conversion can take a long time.

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