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Technology Stocks : The New QLogic (ANCR) -- Ignore unavailable to you. Want to Upgrade?

To: Gus who wrote (27479)	7/13/2000 2:35:52 AM
From: Gus	Respond to of 29386

CoS FAQ from the McData white paper... COMMONLY ASKED QUESTIONS ABOUT CLASS OF SERVICE If I am choosing between Class 2 and Class 3 for my application, what factors should I consider to make the best decision? Generally, Class of Service selection is part of the device driver, not the application. If a selection can be made, the following are recommended. For installations requiring reliable connections, Class 2 is the best choice. Class 3 connections are the best choice for limited configurations which provide error recovery at the application layer. Can I configure both Class 2 and Class 3 connections and still have interoperability? Yes. Switches support intermixed Class 2 and Class 3 frames. Can I implement a mix of vendor devices that support Class 2 and Class 3 and still have interoperability? Yes. However, you will need to confirm with your vendor. Ask for an interoperability matrix. If devices on the fabric support multiple Class of Service options, what determines the default class? The default class is usually software selectable at the time of installation. Some devices have built-in defaults or fixed settings. Most, however, are flexible enough to change Class of Service mode based on the requirements of the destination node with which they need to communicate. What about interoperability with Classes 4, 5, and 6 in the future? How can I make sure I'm not limiting my options? The standards provide for intermixing multiple Classes of Service. However, discuss these issues with your vendor before proceeding. How can I confirm that I am actually getting the Class of Service that I configured into the system? The best independent means to verify the Class of Service is through the use of a Fibre Channel analyzer. The analyzer can identify the Class of Service used in each frame by reading its frame delimiter.