Cluster operations on the local host are automatically stopped and restarted if necessary. If an error exists in the parameters, the host will not join the cluster, and a warning is displayed. If this should occur, open the NLB Properties dialog box to fix the problem. Displays extensive information about your current NLB parameters, cluster state, and past cluster activity.
The last several event log records produced by NLB are shown, including the binary data attached to those records. This command is designed to assist in technical support and debugging. The registry information retrieved by the display command shows what the next state of NLB would be if a reload or some other operation that causes the driver to read the registry were to be performed. The registry information might or might not be the current state of NLB.
Displays information about your current NLB configuration. This command is similar to the display command, however, instead of retrieving the information from the registry, the params command queries directly from the kernel-mode driver. The information displayed is therefore the current state of NLB. In addition to the configuration information, the nlb params command displays state variables from the kernel, including the current number of connections being maintained by NLB and the number of dynamic allocations that have been necessary for connection tracking.
Displays the media access control address corresponding to the specified cluster name or IP address. If multicast support is enabled, the multicast media access control address is used by NLB for cluster operations.
Otherwise, the unicast media access control address is used. This command is useful for creating a static ARP entry in the router if necessary. The following table describes the possible options. The cluster parameter can be either the cluster's full Internet name or the cluster's primary IP address. You can omit the cluster option when running nlb.
In this instance, the command applies only to the local cluster host. To address the cluster as a whole or a different host within the cluster, you must also specify the target cluster, or target cluster and specific host together.
The host parameter specifies which host within the cluster to which the command should be applied. If the host parameter is omitted, the command applies to all hosts within the cluster. You can specify host name using the internet host name, the IP address, or the unique host priorities assigned in the Network Load Balancing Properties dialog box. You can use the special host priority value 0 zero to refer to the default host within a cluster. You can omit the host option when running nlb.
NLB hosts can be configured to join the cluster automatically upon startup or to wait for the nlb start command by enabling the initial host state option in the Network Load Balancing Properties dialog box. You can use this command with the nlb stop command to change cluster parameters for the local host without taking the entire cluster offline. You can modify the parameters for example, to add a port rule without disrupting the cluster's service to the clients.
To do this, take a host out of the cluster, update its parameters, and then return it to the cluster. During this process, other cluster hosts will detect inconsistencies in the rules, and they will handle these inconsistencies in a manner that minimizes disruption of service to the clients.
Create different four shares on four nodes and try to access them from one machine. You must get each time different share when browsing using UNC patch.
NLB doesn't detect application failure. Automatically detects and recovers from a failed or offline computer. Automatically balances the network load when hosts are added or removed. Recovers and redistributes the workload within 10 seconds.
The load is automatically redistributed to other nodes when a host goes offline. All the active connections to that host are lost. If you're internationally taking a node offline, then you can use the drainsstop command to service all the active connections before you take the node offline. You can have a mix of applications running in the NLB cluster.
This way you can designate the traffic for database to SQL server node only. NLB can load balance multiple requests from client on the same node or different node. This is done randomly. NLB automatically detects and removes the failure of NLB Node but it can't judge whether an application is running or stopped working. This should be done manually by running a script. Automatically load balances when new hosts are added or removed and this is done within 10 seconds.
NLB can be enabled on multiple network adapters. This allows you to configure different NLB Cluster. NLB can operate in two modes - Unicast or Multicast but both the modes can't be enabled at the same time. Unicast is the default mode. This traffic is received by all the hosts in cluster and NLB driver filter the traffic as per the Port Rules defined. To enable Extended Affinity you need to set a timeout value on the port rule that you want Extended Affinity.
The timeout value is in minutes and should be set to the time that you want the affinity to persist. The timeout counter is started when the connections is closed.
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