IBM TS2340 User Guide - Page 246
Linux, Data Flow, Linux 3494 Enterprise Tape Library Driver
UPC - 883436006873
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Linux 3494 Enterprise Tape Library Driver Linux The software consists of a daemon that communicates directly with the Library Manager of the 3494 Enterprise Tape Library through Ethernet or Token Ring LAN, a utility program that provides a command-line interface to the daemon, and a C object module that can be linked with user applications to provide a communication interface with the daemon. Note: In the Linux operating system, this is a program that runs unattended, in the background, to perform a standard service. Some daemons are triggered automatically to perform their task; others operate periodically. This software is known as a driver throughout this document because it provides the software and interface necessary to drive the 3494 Tape Library. However, the product does not include a device driver in the true sense of the term. That is, it is not an extension of the operating system kernel, such as a tape device driver. A typical environment for the Linux Automated Tape Library Driver is a Linux workstation that acts as a data server on a network with tape devices providing backup or restore and data server functions. The Library Manager control point daemon (lmcpd) is provided in the package. The lmcpd is a process that is always running on the system. It provides direct communication with the Library Manager. An application links with the supplied C object module using the interface described in the IBM Tape Device Drivers: Programming Reference. The subroutines in this module communicate with the lmcpd to perform the various library operations using standard UNIX namespace sockets. The lmcpd communicates with the Library Manager through TCP/IP. The /etc/ibmatl.conf configuration file is used to define the attachment for each library. Refer to "Defining the Symbolic Name to the lmcpd" on page 237 for more information. Data Flow The software described in this chapter covers the library driver. The interface between the application and the library driver is described in the IBM Tape Device Drivers: Programming Reference. Figure 62 on page 229 illustrates the data flow. 228 IBM Tape Device Drivers Installation and User's Guide