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Where are security credentials saved on the server?

Is there anything similar to Domain Controller that stores user names, separately or with WWN, port numbers and domain names, and verifies against them when the user logs into to a particular server? I didn't see any user credentials in SNS table of the switch.
The WWN and port numbers may be saved in the individual devices. However, the security credentials should be saved in the RADIUS Server -- assuming the vendor implements the CHAP protocol for authentication.

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