WHM contains a useful tool that allows you to view a chart of bandwidth usage per account on a monthly basis.
1) Go to Account Information.
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2) Select View Bandwidth Usage.
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Here is the Bandwidth Usage page. This tool logs HTTP, FTP, and e-mail traffic, which accounts for almost all traffic that a normal account will use.
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To track bandwidth for other applications, such as a game server or voice server, you'll need to use a tool such as bandmin.
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Note that subdomains that have not transferred any bandwidth trackable by this system will not be shown.
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If any bandwidth was transferred on a parked domain, that bandwidth will be included in the value shown for the domain on which the parked domain is parked.
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As you can see, we're currently viewing bandwidth totals for the month of August 2009. This tool uses best fit units by default -- whether that's gigabytes or megabytes.
3) You can force it to use megabytes using this button.
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4) Click again to switch back.
5) You can use the Last Month and Next Month links to switch to the respective months.
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Notice that we're now viewing July's bandwidth totals.
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Each row lists an account's username and main domain. Next to that is the amount transferred for this month, then the current bandwidth limit, ending with a percentage bar that represents total bandwidth usage. When an account reaches 70% and 85% of its bandwidth limit, its row will be highlighted in yellow or red, respectively, as shown in the Legend below.
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If an account is a reseller, clicking this black checkmark next to the username will send you to a bandwidth list just for all the accounts it owns.
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If an account has any subdomains, parked domains, or addon domains with any data transfer for this month, you'll be able to view them by clicking a + sign that appears, as shown in the legend below.
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You can change an account's quota from here using these edit icons.
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The last statistic on this page is the Total Bandwidth Usage across all accounts, shown down here.
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That's all there is to see here. Now you know how to take a comprehensive look at your monthly bandwidth usage in WHM.
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