Most hosting problems customers report, such as "my email stopped" or "the site is slow", start with a full quota or a resource limit. As a reseller you can see all of this in WHM. A short weekly check prevents most tickets.
Before you start
- WHM access on your reseller plan.
- Customers on packages with sensible limits (see creating packages).
Disk space
- Go to WHM → Account Information → List Accounts and sort by Disk Used.
- Open WHM → Account Information → Show Accounts Over Quota to see accounts that have hit their limit.
A full quota stops new email from arriving and blocks uploads and backups. Ask the customer to clean up or upgrade their package.
Bandwidth
- Go to WHM → Account Information → View Bandwidth Usage.
- Choose the month and view the transfer per account. Click an account for a breakdown by protocol (HTTP, email, FTP).
When an account goes over its monthly bandwidth, cPanel shows visitors a "bandwidth limit exceeded" page until the next month or until you raise the limit in Modify an Account.
CPU, memory and I/O (CloudLinux)
MdmHost servers run CloudLinux, so each account has its own CPU, memory, I/O and process limits. To see who is hitting them:
- Go to WHM → Plugins → CloudLinux Manager (shown as LVE Manager on some servers).
- Open the Current Usage tab for live usage, or Historical Usage for the last hours and days.
- Look at the Faults columns. Frequent faults mean the account is being slowed or getting 508 errors.
Detailed steps for setting limits are in managing limits in CloudLinux Manager, and what each limit means is in CloudLinux limits for resellers.
Tip: Customers can see their own graphs in cPanel → Metrics → Resource Usage. Point them there before changing limits; often a plugin or bot traffic is the real cause.
A weekly checklist
- Accounts over 90% of quota.
- Accounts with many CloudLinux faults in the last 7 days.
- Unexpected bandwidth spikes, which can mean hotlinking or a compromised site.
- Your total reseller usage against your plan (see reseller limits).
Troubleshooting
CloudLinux Manager is not in Plugins
The reseller interface may be disabled for your plan. Open a ticket and we will check.
Bandwidth shows zero
Statistics run on a schedule; new accounts can show zero for several hours.
Frequently asked questions
Why is a site slow if it is under its quota?
Disk quota and speed are separate. Slowness usually comes from CloudLinux CPU or entry process limits, which you see as faults in CloudLinux Manager, or from an uncached site. Enabling LiteSpeed Cache often fixes it.
Can I raise CloudLinux limits for one customer?
Yes, within your own plan maximums. Set user-level limits in CloudLinux Manager or use a package with higher limits.
Do email and backups count towards disk usage?
Yes. Mailboxes, backups stored in the home directory and logs all count. Old backup archives in the home directory are a common cause of full quotas.
What is a healthy fault count?
A few faults during traffic peaks are normal. Hundreds per day, or faults every hour, mean the account needs optimisation or a higher package.