The World Wide Name (WWN) is a unique identifier for a Fibre Channel (FC) port. It is used to identify the port to other FC devices, such as switches and HBAs. The WWN is typically burned into the hardware of the FC port, but it can also be configured in software.
There are two types of WWNs: Node WWNs (NWNNs) and Port WWNs (PWNNs). NWNNs identify the physical FC port, while PWNNs identify the logical FC port. A single physical port can have multiple logical ports, each with its own PWNN.
To check the WWN of a FC port in Linux, you can use the following command:
$ sudo lspci -v | grep FC
This command will list all of the FC ports on the system, along with their WWNs.
WWNs are important for managing FC SANs. They are used to identify ports to other FC devices, and to configure zoning and other SAN settings.
1. lspci – This command can be used to list all of the PCI devices on the system, including FC ports.
The lspci command is a useful tool forabout the PCI devices on a Linux system. This information can be helpful for troubleshooting hardware problems or for configuring the system.
The lspci command can be used to list all of the PCI devices on the system, including FC ports. This information can be helpful for checking the WWN of a FC port.
To check the WWN of a FC port, you can use the following command:
$ sudo lspci -v | grep FC
This command will list all of the FC ports on the system, along with their WWNs.
The WWN is a unique identifier for a FC port. It is used to identify the port to other FC devices, such as switches and HBAs.
WWNs are important for managing FC SANs. They are used to identify ports to other FC devices, and to configure zoning and other SAN settings.
2. grep – This command can be used to filter the output of lspci to only show the FC ports.
The grep command is a powerful tool for filtering text data. It can be used to search for specific patterns in a file or stream of text. In the context of checking the WWN of a FC port in Linux, grep is used to filter the output of the lspci command to only show the lines that contain the string “FC”. This is useful because the lspci command lists all of the PCI devices on the system, including FC ports, and we are only interested in the FC ports.
To use grep to filter the output of lspci, we can use the following command:
$ sudo lspci -v | grep FC
This command will list all of the FC ports on the system, along with their WWNs.
The grep command is an essential tool for working with text data in Linux. It can be used to filter, search, and process text data in a variety of ways. When checking the WWN of a FC port in Linux, grep is used to filter the output of the lspci command to only show the lines that contain the string “FC”. This is useful because it allows us to quickly and easily identify the FC ports on the system.
3. WWN – This is the keyword that you are looking for in the output of lspci – grep.
The World Wide Name (WWN) is a unique identifier for a Fibre Channel (FC) port. It is used to identify the port to other FC devices, such as switches and HBAs. The WWN is typically burned into the hardware of the FC port, but it can also be configured in software.
To check the WWN of a FC port in Linux, you can use the following command:
$ sudo lspci -v | grep FC
The output of this command will include the WWN of the FC port. The WWN is a 16-digit hexadecimal number. The first 8 digits of the WWN are the Node WWN (NWNN), and the last 8 digits are the Port WWN (PWNN).
The NWNN identifies the physical FC port, while the PWNN identifies the logical FC port. A single physical port can have multiple logical ports, each with its own PWNN.
WWNs are important for managing FC SANs. They are used to identify ports to other FC devices, and to configure zoning and other SAN settings.
FAQs on How to Check WWN in Linux
This section provides answers to frequently asked questions related to checking the World Wide Name (WWN) of a Fibre Channel (FC) port in Linux.
Question 1: What is a WWN and why is it important?
Answer: A WWN is a unique identifier for a Fibre Channel port. It is used to identify the port to other FC devices, such as switches and HBAs. WWNs are important for managing FC SANs because they are used to identify ports to other FC devices and to configure zoning and other SAN settings.
Question 2: How can I check the WWN of a FC port in Linux?
Answer: To check the WWN of a FC port in Linux, you can use the following command: sudo lspci -v | grep FC. The output of this command will include the WWN of the FC port.
Question 3: What is the difference between a NWNN and a PWNN?
Answer: The NWNN (Node WWN) identifies the physical FC port, while the PWNN (Port WWN) identifies the logical FC port. A single physical port can have multiple logical ports, each with its own PWNN.
Question 4: How can I configure the WWN of a FC port?
Answer: The WWN of a FC port is typically burned into the hardware of the port, but it can also be configured in software. To configure the WWN of a FC port, you can use the following command: sudo fcconfig -w wwn . Replace with the new WWN that you want to configure.
Question 5: What are some common problems that I might encounter when checking the WWN of a FC port?
Answer: Some common problems that you might encounter when checking the WWN of a FC port include:
The lspci command not being installed on your system.The FC port not being properly configured.The FC port not being recognized by the operating system.
Question 6: Where can I find more information about checking the WWN of a FC port in Linux?
Answer: You can find more information about checking the WWN of a FC port in Linux in the following resources:
IBM Knowledge Center: Managing Fibre Channel adaptersRed Hat Enterprise Linux documentation: Configuring Fibre Channel adapters
Summary: Checking the WWN of a FC port in Linux is a relatively simple process that can be accomplished using the lspci command. By following the steps outlined in this article, you can easily check the WWN of a FC port and troubleshoot any problems that you might encounter.
Next: For more information on managing FC ports in Linux, please refer to the resources provided in the “More Information” section.
Tips for Checking the WWN of a FC Port in Linux
Checking the World Wide Name (WWN) of a Fibre Channel (FC) port in Linux is a relatively simple process, but there are a few things you can do to make the process easier and more efficient.
Tip 1: Use the correct command. The most common command for checking the WWN of a FC port is lspci -v | grep FC. This command will list all of the PCI devices on the system, including FC ports.
Tip 2: Use the grep command to filter the output. The grep command can be used to filter the output of the lspci command to only show the lines that contain the string “FC”. This will make it easier to find the WWN of the FC port.
Tip 3: Use the WWN keyword to identify the WWN. The WWN is a 16-digit hexadecimal number. The first 8 digits of the WWN are the Node WWN (NWNN), and the last 8 digits are the Port WWN (PWNN).
Tip 4: Use the fcconfig command to configure the WWN. The fcconfig command can be used to configure the WWN of a FC port. This can be useful if you need to change the WWN of a FC port.
Tip 5: Use the fdisk command to check the WWN of a disk. The fdisk command can be used to check the WWN of a disk. This can be useful if you need to find the WWN of a disk that is not connected to the system.
Summary: Checking the WWN of a FC port in Linux is a relatively simple process. By following these tips, you can make the process easier and more efficient.
Next: For more information on managing FC ports in Linux, please refer to the resources provided in the “More Information” section.
Closing Remarks on Checking WWN in Linux
In summary, checking the World Wide Name (WWN) of a Fibre Channel (FC) port in Linux is a crucial step for managing FC SANs. The WWN serves as a unique identifier for FC ports, enabling them to be recognized and configured within a storage network.
This article has provided a comprehensive guide on how to effectively check the WWN of a FC port in Linux, utilizing commands like lspci, grep, and fcconfig. By following the outlined steps and incorporating the provided tips, system administrators can efficiently identify and manage FC ports, ensuring optimal performance and data accessibility within their Linux environments.
