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urgent please help - brocade zoning and changing WWN

Hi all, we have had an issue with one of the devices on our SAN network, this means chaning the device, the engineer said we will need to change the name of the World wide name on the brocade to match. My question is, what is the WWN for? and do you assign it to one port, or a number of ports,and does a device that wants to talk to another device need to have the same WWN?

please help

cheers

Carl

1 REPLY
Bronze

Re: urgent please help - brocade zoning and changing WWN

Hi Carl,

I'm presuming that you are talking about having either a whole server replaced or you replaced a HBA (host bus adapter (fibre channel card in a server)).

A WWN (World Wide Number) is a unique identifier in the fibre channel space much like a MAC address. WWN's are used for security purposes generally to prevent/allow devices from seeing each other.

In that case, you will need to reconfigure any zones that were configured for that host/hba. A zone is a method of preventing devices from seeing each other on a fibre channel SAN (its kinda like an ACL).

You will most likely have to make some changes on any disk arrays because they generally would be configured to only allow certain hosts or HBA's to see certain LUN (Logical Unit (a slab of disk)). This is called LUN masking or sometimes called LUN security.

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