X-Small
For Salesforce Orgs with up to 20 total active Salesforce Users
Small
For Salesforce Orgs with 21 to 250 total active Salesforce Users
Medium
For Salesforce Orgs with 251 to 1,000 total active Salesforce Users
4
Large
For Salesforce Orgs with 1,001 to 2,000 total active Salesforce Users
4
X-Large
For Salesforce Orgs with more than 2,000 active Salesforce Users and for multi-org deployments