You must make an external group accessible to the CommServe computer before you set a quota for the external group.
An external group must exist on a domain controller that the CommServe computer can reach, and you must associate the external group with a CommCell user group.
Procedure
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In the CommCell Browser, expand Security > Domains and look for the domain.
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If the domain does not appear under Domains, perform the steps given in Adding a Domain Controller for Active Directory.
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Expand domain and click External Groups.
The External Groups tab appears.
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Right-click the group name, and then click Properties.
The Edit Properties of External Group dialog box appears.
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Select Enforce File System Quota.
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To specify the amount of backup data that end users can create, in the Disable data protection when quota usage exceeds box, enter a quota amount.
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Click OK.