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The Filesystem Layer

In addition to the conventional UNIX and NFS file systems supporting the magnetic disks for the electronic library, we are using the EpochServ filesystem software to support access to the optical disk jukebox. For all intents and purposes this software hides the fact that data may be written on multiple platters in the optical jukebox. Directory information is maintained on magnetic disk for faster search and access by name, and some data caching is provided for frequently used data sets. In the current configuration, the library of technical reports appears as a normal UNIX hierarchical file system with separate directories for each report and individual TIFF image files for each page in the report, or one or more PostScript files.



Wed Mar 2 13:42:59 PST 1994