1. SINN01 Technical Workshop Oldenburg 5-7 Dec 2001 Technical Discussion SINN01 Technical Workshop

2. Oldenburg 5-7 Dec 2001 2 Technical Discussion  Topology  of interest, when many mirrors  Collection of Content  Distribution of Content (mirroring of webpages)  Mirror-Script

3. SINN01 Technical Workshop Oldenburg 5-7 Dec 2001 3 Requirement: Mirror-Script  Public Domain  System independent  Easy to install (and configure)  Incremental file-transfer  HTTP for protocol  Update time to be conserved  check of file size (must be > 0)

4. SINN01 Technical Workshop Oldenburg 5-7 Dec 2001 4 Requirement: Mirror-Script  Checksum for files (MD 5 ?)  Switch  Script automatically deletes old (= out of date) files  Script has no rights to delete any files  List of files, which should be deleted by the admin

5. SINN01 Technical Workshop Oldenburg 5-7 Dec 2001 5 Technical Discussion  Distribution of Search-Engine  Harvest-Network PHYSICS WEB Gatherer Broker

6. SINN01 Technical Workshop Oldenburg 5-7 Dec 2001 6 Technical Discussion  Distribution of Search-Engine  Harvest-Network  Distributed Brokers  Distributed Gatherers (for regions)  Gatherers Collection Frequency (at least once in 2 months)  Brokers collect on weekend with 1st Sunday in month  Broker- and Gatherer-Configuration as part of PhysNet (Mirrors)  Mailing list for Harvest-Administrators

7. SINN01 Technical Workshop Oldenburg 5-7 Dec 2001 7 Technical Discussion  Availability of Service  Network connection (from Client to Server)  still problem => experts  Service connection (does the Search Engine work?)  “Flag” service is running or not running  in case of “not running”:  List of other mirror sites  User should decide, where to go  No auto-forwarding, because of net-topology  possible next step: Server knows, which other servers are running