NetApp
Configuration : Local Users and Groups > Users : Understanding local users : When you should create local user accounts
When you should create local user accounts
There are several reasons for creating local user accounts on your storage system.
You should create one or more local user accounts if your system configuration meets the following criteria:
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If, during setup, you configured the storage system to be a member of a Windows workgroup.
In this case, the storage system must use the information in local user accounts to authenticate users.
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If your storage system is a member of a domain:
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Local user accounts enable the storage system to authenticate users who try to connect to the storage system from an untrusted domain.
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Local users can access the storage system when the domain controller is down or when network problems prevent your storage system from contacting the domain controller. For example, you can define a BUILTIN\Administrator account that you can use to access the storage system even when the storage system fails to contact the domain controller.
Note: If, during setup, you configured your storage system to use UNIX mode for authenticating users, the storage system always authenticates users using the UNIX password database.