1. D0 Taking Stock 11/2004 - 06/2005 Calibration Database Servers

2. Overview Overview Successfully running during the last calendar year Successfully running during the last calendar year No major problems have arisen No major problems have arisen Mature product with low maintenance requirements Mature product with low maintenance requirements 10 different types of Calibration dbservers currently running 10 different types of Calibration dbservers currently running Muon servers, farms and users, are available but are still not being used Muon servers, farms and users, are available but are still not being used Can d0reco be changed so these servers be can shut down? Can d0reco be changed so these servers be can shut down?

3. Deployment Remote Servers now exist at: Remote Servers now exist at: Karlsluhe, IN2P3, Imperal College, WestGrid, SAR Karlsluhe, IN2P3, Imperal College, WestGrid, SAR Remote sites beginning to run within the next few weeks: Remote sites beginning to run within the next few weeks: OSCER (this is mostly Univ. of Oklahoma) Prague Manchester Wisconsin CMS (at fnal) Lancaster (it may take bit for Lancaster to get going due to manpower limits) RAL (same comment as for Lancaster) OSCER (this is mostly Univ. of Oklahoma) Prague Manchester Wisconsin CMS (at fnal) Lancaster (it may take bit for Lancaster to get going due to manpower limits) RAL (same comment as for Lancaster) Possible new remote sites: Possible new remote sites: Michigan State, Brookhaven, SLAC Michigan State, Brookhaven, SLAC Remote Servers are processing data with p17.03.03 of d0reco. Remote Servers are processing data with p17.03.03 of d0reco.

4. Hardware Production nodes Production nodes Two nodes, with servers divided for farms/users Two nodes, with servers divided for farms/users Dual 1.5 GHZ AMD Athlon w/2 GB Memory Dual 1.5 GHZ AMD Athlon w/2 GB Memory Failover nodes Failover nodes Two nodes, one serving each production node Two nodes, one serving each production node 1, Dual 1.5 GHZ AMD Athlon w/2 GB Memory (farms) 1, Dual 1.5 GHZ AMD Athlon w/2 GB Memory (farms) 1, Dual 1.0 GHZ Pentium III w/1 GB Memory (users) 1, Dual 1.0 GHZ Pentium III w/1 GB Memory (users) Hardware is supporting current loads and is expected to support load increase. Hardware is supporting current loads and is expected to support load increase. Contingency plan is to add new nodes and servers. Contingency plan is to add new nodes and servers.

5. Concerns & Plans Increasing Farms Load Increasing Farms Load 160 Additional dual processor, and faster, CPUs being added 160 Additional dual processor, and faster, CPUs being added Db servers are expected to be able to handle the expected load increase. Db servers are expected to be able to handle the expected load increase. Contingency plan: Contingency plan: Added a new node with additional servers, split the farm requests across servers, develop a load manager. Added a new node with additional servers, split the farm requests across servers, develop a load manager.

6. Concerns & Plans Multi-Run Data Sets Multi-Run Data Sets For each distinct run the client will request an entire calibration set. For each distinct run the client will request an entire calibration set. Db servers may face difficulties trying to handle diverse multi-run sets of events from multiple users. Db servers may face difficulties trying to handle diverse multi-run sets of events from multiple users. Possible solutions: Possible solutions: Double the size of the cache from ~20 runs to ~40runs Double the size of the cache from ~20 runs to ~40runs May require additional Linux boxes. May require additional Linux boxes. Add additional Linux boxes with large cache servers. Develop a load manager for distribution of requests. Add additional Linux boxes with large cache servers. Develop a load manager for distribution of requests. Maintenance & Support Maintenance & Support Upgrade is underway to version 4.x of omniORBpy. Upgrade is underway to version 4.x of omniORBpy. Some minor bugs will be addressed during the upgrade. Some minor bugs will be addressed during the upgrade. Continue providing support for remote sites. Continue providing support for remote sites.