Additional Hardware Specifications
Storage for Digital Copies
To give us the greatest possible flexibility in developing the project, we decided to form the server out of two interlinked computer systems, a standard IBM System 390 with the OS/390 Open Edition version as the operating system and a standard IBM RS/6000 System with the AIX version of the UNIX operating system. Both these components may be incrementally grown as the project's server requirements increase. Both systems are relatively commonplace at academic sites. Although only one system pair is needed in this project, it is likely that eventually two pairs of systems would be needed for an effort on the national scale. Such redundancy is useful for providing both reliability and load leveling.
Both campus's networks and the statewide network that connects them uses the standards-based TCP/IP protocols. Any networked client workstation that follows our minimum standards will be able to use the digital delivery system being constructed. The minimum transmission speed on the CWRU campus is ten million bits per second (M bps) to each client workstation and a minimum of 155 M bps on each backbone link. The principal document repository is on the IBM System 390, which uses a 155 M bps ATM (asynchronous transfer mode) connection to the campus backbone. The linkage to the University of Akron is by way of the statewide network in which the principal backbone connection from CWRU is also operating at 155 M bps, and the linkage from the UA to the statewide network is at 3 M bps. The on-campus linkage for UA is also a minimum of 10 M bps to each client workstation within the chemical sciences scholarly community and to client workstations in the UA university library.