Resources (located at Service Plans > select a plan > Resources tab) define what system resources are provided with the subscription.
Overuse policy
Defines what happens if the subscription's usage of disk space and traffic reaches limit values:
You can select Notify me by email in cases of overuse to notify users as soon as disk space or traffic usage exceeds the specified limit (the Notify when disk space usage reaches and Notify when traffic usage reaches options). The notifications will be sent to the users or email addresses specified at Tools & Settings > Notifications: Resource usage limits exceeded by subscription.
You can select Notify me by email in cases of overuse to notify users as soon as any resource is overused. The notifications will be sent to the users or email addresses specified at Tools & Settings > Notifications: Resource usage limits exceeded by subscription.
Note: The overuse policy does not apply to the limits set on size of mailboxes. Therefore, even if you enable overuse, be sure to allocate enough disk space to mailboxes.
Disk space
The total amount of disk space allocated to the subscription. It includes disk space occupied by all files related to the subscription: content of websites, databases, applications, mailboxes, log files, and backup files.
Notify when disk space usage reaches
Available only if overuse of disk space and traffic is allowed. This sets the notification limit for disk space usage. When this limit is reached, Plesk sends notifications to users' email addresses specified in Tools & Settings > Notifications: Resource usage limits exceeded by subscription.
Note: The notification limit can be set in MB/GB/TB or in percent. If the limit should be persistent, you can specify it in MB/GB/TB (in this case, after you add an add-on which enhances disk space for the subscription, this limit remains unchanged). If the notification limit should be floating, you can specify it in percent (in this case, after an add-on is added, the limit will be automatically recalculated). For example, if you have disk space = 10Gb, set a notification limit = 9Gb and add an add-on with 5 Gb of disk space, notification will be sent after 9Gb is exceeded. And if in the same case you set a notification limit = 90%, notification will be sent after 13.5Gb is exceeded.
Traffic
The amount of data that can be transferred from the subscription's websites and FTP/Samba shares during a month.
Notify when traffic usage reaches
Available only if overuse of disk space and traffic is allowed. This sets the notification limit for traffic usage. When this limit is reached, Plesk sends notifications to users' email addresses specified in Tools & Settings > Notifications: Resource usage limits exceeded by subscription.
Sites published with Presence Builder
The number of websites that can be published with Presence Builder.
Domains
The total number of domain names that the subscriber will be able to host within the subscription. This includes websites, web forwarding configurations that point to websites hosted on other servers, and domain names on which a website or web forwarding is not yet set up (domains with no hosting).
Subdomains
The total number of subdomains that the subscriber will be able to host within the subscription.
Domain aliases
The total number of additional alternative domain names that the subscriber will be able to use for their websites.
Mailboxes
The total number of mailboxes that the subscriber can host within the subscription.
Mailbox size
The amount of disk space that is allocated to each mailbox in a subscription for storing email messages and auto-reply attachment files.
Total mailboxes quota (Windows hosting)
The total amount of disk space in megabytes available for all mailboxes within the subscription.
Mailing lists
The total number of mailing lists that the subscriber can host within the subscription.
Additional FTP accounts
The maximum number of FTP accounts used to access the files and folders created within a subscription. This number does not include an account that is always created during the subscription creation.
Databases (Unix hosting)
The total number of databases that can be created on the Plesk database servers and used by the subscription's websites.
MySQL databases and MS SQL databases (Windows hosting)
The maximum number of MySQL and Microsoft SQL Server databases respectively that can be created on the Plesk database servers and used by the subscription's websites.
Total MySQL databases quota and Total MS SQL databases quota (Windows hosting)
The maximum amount of disk space that MySQL or Microsoft SQL Server databases can occupy respectively on a subscription.
MS SQL database file size (Windows hosting)
The maximum size of a Microsoft SQL Server database file. Note that if a database consists of more than one file, more disk space might be used than you specify here.
MS SQL database log file size (Windows hosting)
The maximum size of a Microsoft SQL Server log file. Note that if a database has more than one log file, more disk space might be used than you specify here.
Validity period/Expiration Date
The period of time during which a subscription is valid.
In service plan properties, it is called Validity period: It is used only for newly created subscriptions. A subscription expiration date depends on it.
In subscription properties, it is called Expiration date: At this date, the subscription is suspended, which means that all sites within the subscription are suspended, and their web, FTP and mail services will no longer be accessible to the Internet users. Also, subscribers and their users cannot log in to the Customer Panel any more.
Subscriptions are not renewed automatically, so to bring a subscription's services back to operation, you will need to manually activate the subscription.
Java applications
The total number of Java applications that can be hosted on websites within the subscription.
Web users
The total number of personal Web pages that the subscriber can host for other users under their websites. This service is mostly used in educational institutions that host non-commercial personal pages of their students and staff. These pages usually have addresses like http://example.com/~webuser.
ODBC connections (Windows hosting)
The total number of ODBC connections that the subscriber can use within the subscription.