What is the difference between Global Buffers, VMS caching and I/O Express?

Global Buffers and VMS caching are useful, but are very limited and no substitute for I/O Express. All three have very different purposes.

1. Global Buffers are good for caching an entire file, but do not cache anything else but that one file.

2. VMS Caching (this is not VIOC) only caches directories, file headers, file IDs, extent, quota and bitmap information - but no file contents.

3. I/O Express caches any data block which can be read: VMS code, application code, file headers, text files, data base files, SYSUAF files, etc.

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