WINS Server Considerations

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WINS Server Considerations

WINS servers are the most critical element of a WINS deployment. Determining how many WINS servers you need, where to place them, and how to configure them are important aspects of pre-deployment planning.

At an absolute minimum, you need one WINS server. Two WINS servers provide some degree of fault tolerance if the primary WINS server fails.

WINS servers don’t have a built-in limit of the number of clients that can be served. A basic rule of thumb is that one WINS server can handle up to 1,500 name registrations per minute, and about 4,500 name queries per minute. As a good estimate, you would need to implement one primary and one secondary WINS server per 10,000 clients.

The WINS server must be running Windows NT Server; the WINS server cannot be installed on a Windows NT workstation. If the WINS server were a multiple processor system, this would increase performance considerably since the WINS server is a multi-threaded application, and can then run one thread on each processor.

One interesting component of the WINS server is that it supports database logging. Database logging is a fault-tolerance feature that maintains a log file in addition to the database. The log contains recent transaction information. If this feature is enabled, the database can be “rolled back” to a known state. However, this also decreases performance because all name registrations are processed twice. The tradeoff is fault tolerance: if logging is disabled, the most recent updates to the WINS database can be lost if the WINS server software crashes.

Finally, if your network spans multiple subnets, client computers can be configured to use WINS servers on the local subnet or on a different subnet. Clearly, this slows performance, and increases traffic through routers. Also, if WINS servers are located on a different subnet than the WINS client computers, the availability of the routers becomes paramount—if they are no longer available, neither are the WINS services.

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