Scaling: Future Improvements

• Multi-session Single Instance Message Store

  • Generate MD5 or SHA-1 hash of message
  • Already in system?

    • Yes

      • Compare binary files, store if different, link otherwise
    • No

      • Store
    • Further reduces disk storage capacity issues
    • Increases synchronous meta-data I/O

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Overall, I donít believe that multi-session single instance message store is a viable technology to be pursued. It reduces things that we donít care so much about (disk storage requirements), and it increases the things we do care most about (synchronous meta-data I/O).

The point of bringing this up now is to show you that this is an option that some vendors are touting, but to also demonstrate its limitations, so that you can see through their vacuous claims.