Configure one server (mainframe host) to communicate with the library through a single  control path. All other servers send requests to that server through a network (as shown in  Figure 4-127). This configuration is used by IBM Spectrum Protect. Configure all of the servers to communicate with the library through a single, common control  path (as shown in Figure 4-128 on page 283). This configuration is used in high-availability  environments, such as IBM High Availability Cluster Multi-Processing (IBM HACMP) from  IBM, and Systems Management Server and Clustered Server Environments from Microsoft.  Multi-initiator configurations are supported only by certain adapters and independent software  vendors (ISVs). For more information, contact your vendor. 282  IBM TS4500 R6 Tape Library Guide All servers to a single control path One server to a single control path Figure 4-127 Separate libraries to separate applications