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When a communication failure occurs between a node and the storage subsystem (for example, due to a failed host bus adapter or a faulty cable), run the atf_restore command as soon as possible after you replace or repair the failed component(s) to restore the cluster to the original access path where the Application-Transparent Failover (ATF) executable programs are stored. Run the atf_restore command from the node that owns the failed-over LUN; if multiple LUN failures occur on both nodes, run the atf_restore command from both nodes.

To run the atf_restore command, follow this procedure:

1.Enter a command prompt window, and change to the directory where the ATF executable programs are stored (for example, directory c:\program files\dell openmanage\powervault manager\ dell openmanage atf\1.x.x).

2.Type atf_restore atf_sp0 and press <Enter> to restore the failed access path.

Refer to the Dell OpenManage ATF Installation and Operation Guide for more informa- tion about using Dell OpenManage ATF.

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You can set up your nodes in three possible configurations: as two stand-alone mem- ber nodes, as two backup domain controllers (BDC), or as a primary domain controller (PDC) and a single BDC. The first two configurations require an existing domain for the nodes to join. The PDC/BDC configuration establishes a new domain of which the one node is the primary domain controller and the other node is the BDC.

You can choose any of the three configurations for clustering, but the recommended default is to have each node as a member of an existing domain. This configuration relieves the nodes from the processing overhead involved in authenticating the user logon.

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Windows NT Server, Enterprise Edition 4.0 requires a static Internet Protocol (IP) address for each network interface controller (NIC) installed in each node. A static IP address is an Internet address that a network administrator assigns exclusively to a system or a resource. The address assignment remains in effect until the network administrator changes it.

The Microsoft Cluster Server software also requires a static IP address for the cluster. Because each node has two NICs, the minimum number of static IP addresses required for a cluster configuration is five (one for each NIC and one for the cluster). Additional static IP addresses are required if Microsoft Cluster Server is configured with application programs that require IP addresses, such as file sharing.

Programs running on the cluster may require additional static IP addresses. Microsoft SQL Server 6.5, Enterprise Edition requires at least one static IP address for the vir- tual server (Structured Query Language [SQL] does not use the cluster’s IP address).

3-6 Dell PowerEdge Cluster FE100 Installation and Troubleshooting Guide