3-16 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
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File statistics help you determine when to schedule snapshots by enabling you to see
when most file activity takes place on a volume. Using the filestats command
also helps you determine snapshot disk consumption.
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Enter the filestats command with the ages option to display a daily breakdown of
file changes in a volume, as shown in the following example:
filestats ages 1D,2D,3D,4D,5D,6D,7D,8D,9D,10D,11D,12D,
13D,14D volume vol0 snapshot hourly.0
Use the daily age breakdown displayed in the CUMULATIVE TOTAL KB column of
the AGE output to determine the average change in data per day.
Divide the amount of disk space you want to reserve for snapshots by the daily
change average. For example, if you find that the average daily change rate is
3 GB and you have a 200 GB volume, 40 GB (or 20 percent) of which you want to
reserve for snapshots, divide 40 by 3 to determine the number of daily snapshots