Many times quota for all the users in whm turns to have unlimited disk space available or 0 Megs of quota in use.
This may create confusion for clients as well as at our end as it doesn’t reflect actual amount of disk usage.

Reasons for quota problems are
– Some files owned by the same user elsewhere on the server
– Backup directory files are getting counted under that users quota
– Cpanel updated and quota is showing unlimited after that
– some extra log files are counted under user’s quota

The simple way to fix this issue as
login into your shell with root login details and run

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/scripts/fixquotas

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This script calculates the quota of the entire server and that’s why it take several hours to get complete as it needs to calculate some GB’s of data on the server.