• In April 1996, we started with one HP-UX workstatation, hosted by the Department of Computer Science, and one Sun Solaris workstation, hosted by the Institute for Computer Networks and Operating Systems, useing the Harvest Cache Software.
  For our tests, only one cache has had bidirectional relationships to extern neighbor caches at the FU Berlin, TU Chemnitz, DKRZ Hamburg and the Universities Bochum and Mainz.
• In September 1996 we switched over to the Squid Internet Object Cache and integrated the third cache, hosted by the Department of Mathematics, for a better load distribution and a bigger overall cache size.
  At this point, we decided to setup a cache hierarchy and to use the new founded DFN Cache Service in B-WiN.
  A new Sun Solaris workstation with ATM connection was setup as a dedicated parent cache (FIN cache) for all other caches only and as client of the DFN Caches.
  All bidirectional relationships to extern neighbors have been canceled, except to the TU Chemnitz (same B-WiN node).
  The FU Berlin, FSU Jena and DKRZ Hamburg are still useing this parent as one of their neighbors.
• In November 1996 the 4th cache (Med1 Cache), hosted by the Medical Academy, joined our cache hierarchy, with the primary purpose of reducing the load on their firewall and the traffic between the backbones of the university and the academy.
• In April 1997, the Computer Center of our University decided to setup a proxy cache (URZ Cache) as well, which was integrated in our hierarchy at the beginning of March 1997.
• May 97: DKRZ Hamburg doesn't use our parent cache as sibling anymore (switched over to DFN caches).
• July 97: TU Chemnitz doesn't use our parent cache as sibling anymore (switched over to DFN caches). In August 1997, our parent cache got an upgrade from 64 to 384 MB RAM and from a 6 GB to a 12 GB HDD caching area. Also the cache of the University Computer Center got an upgrade from 128 to 384 MB RAM and from a 1 to a 8 GB HDD caching area.
  This big power gave us the opportunity, to take the two other caches of the Department of Computer Science and the one cache of the Department of Mathematics smoothly out of duty in the following months.
• In September 1997, the Medical Computer Center installed a second cache (MRZ cache), which has been integrated into the university cache hierarchy. When the complete transition to this cache has been made, Med1 cache will be taken out of duty.
• October 1997: Due to the changes in the DFN chache hierarchy we use only 4 of the DFN caches anymore (Leipzig, Nuernberg for .com, Berlin, Hamburg for !.com).
  Med1 cache is of duty.
• November 1997: Because of the slow response of the DFN-caches, their status was changed from parent to sibling in the middle of the month.
• Februar 1998: The proxy cache of Boerde e.V. (BEV) is a new child of the FIN cache.
• May 1998: FIN cache got an RAM upgrade (384 MB -> 512 MB); Neighbor relation with proxy cache of the TU Chemnitz has been skipped. First use of redirectors (jesred 1.0) for replacing advertisment pictures (which really slow down the complete download of many W3 pages).
• June 1998: New add. HDD cache for the FIN Cache (upgrade from 12 to 24 GB). As well it got a new child: proxy cache of the Werner-von-Siemens-Gymnasium (WSG). The HDD cache of the URZ cache was changed back from 1 GB to 8 GB. Since now it is using the FIN Cache as sibling only (previously as parent).

Current Status