What is wwn in linux

The wwn in Linux is an address used to uniquely identify a storage device in a storage network. wwn is a 64-bit value consisting of two parts, an 8-bit name type identifier and a 56-bit Unique identifier. In Linux systems, wwn is usually used to identify disks, Fiber Channel devices, and other storage devices.

The operating environment of this article: Linux 6.4.3 system, DELL G3 computer.

The WWN (World Wide Name) in Linux is an address used to uniquely identify a storage device in a storage network. WWN is a 64-bit value consisting of two parts: an 8-bit name type identifier (NAA) and a 56-bit unique identifier. In Linux systems, WWNs are commonly used to identify disks, Fiber Channel devices, and other storage devices.

The purpose of WWN is to ensure the uniqueness of storage devices in the entire storage network. Since there may be a large number of storage devices and hosts in the storage network, using unique WWNs can ensure correct identification and communication of devices.

In Linux systems, WWN consists of multiple parts, including node name and port name. A node name is a unique identifier that identifies a storage device or host, while a port name is used to identify different ports within a storage device. By combining the node name and port name, the complete WWN value can be obtained.

WWN is usually used to store network configuration and management in Linux systems. Administrators can use WWNs to determine storage device connection and configuration information, such as determining whether the storage device is connected through Fiber Channel or iSCSI.

Using WWN for storage device management can provide the following benefits:

1. Uniqueness: Using WWN can ensure the uniqueness of the storage device in the entire storage network and avoid conflicts and errors.

2. Simplified configuration: By using WWN, administrators can accurately configure the connection and communication of storage devices. This makes configuration easier and more accurate.

3. Tracking and detection: By identifying the WWN of a storage device, administrators can more easily track and detect the status and performance of the storage device.

4. Security: WWN can be used for authentication and access control in the storage network. By authorizing WWNs, administrators can restrict access rights to storage devices and improve security.

In general, WWN is an important concept in Linux systems, used to uniquely identify storage devices and simplify the configuration and management of storage networks. By using WWN, administrators can more easily track, manage and protect storage devices, improving the performance and security of storage networks.

However, it should be noted that WWN may vary in different storage technologies and devices. Therefore, when using WWN, administrators should have a certain understanding of specific storage devices and technologies, and perform corresponding configuration and management based on actual conditions.

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