IBM TS2340 User Guide - Page 227

3494 Library Emulation 3494 Library Emulation The 3494 Library Emulation support provides the ability to use applications that were written for the 3494 API on host attached SCSI Medium Changer Libraries, specifically for migration to the 3584 Ultra Scalable Library with 3592 drives. Overview Existing customer scripts using the mtlib program and customer or ISV applications require no or minor changes to use, depending on the 3494 functions being used. Customer and ISV applications only need to be recompiled with the new libibm.o object module in order to use the emulation support. The mtlib 3494 user command line interface program that has the same syntax and output on every operating system and also provides a common utility for SCSI Medium Changer Libraries. Current operating system device driver utilities vary by syntax/output, require a knowledge of SCSI Medium Changers to use, and require multiple commands to perform a single mtlib command. 3494 Emulation Design The 3494 Emulation support adds a libsmc extension to the current libibm.o object module that applications compile with for existing 3494 support. The libsmc extension contains the 3494 API Emulation support, which issues SCSI Medium changer commands to the library using the operating system SCSI Medium Changer device driver. Figure 50 and Figure 51 on page 210 show the 3494/SMC data flow between existing applications and components and the new libsmc extension. 3494/ SMC Library Data Flow Tape Device Driver Adapter Device Driver Library Tape Drive Application LIBIBM.O Object Module LMCPD LIBSMC SMC Device Driver Figure 50. 3494/SMC Library Data Flow TCP/IP Adapter Device Driver 3494 Library Manager SCSI Medium Changer a28t1001 Chapter 9. 3494 Enterprise Tape Library Support 209