1. LCG 3D StatusDirk Duellmann1 LCG 3D Throughput Tests Scheduled for May - extended until end of June –Use the production database clusters at tier 1 and obtain a first estimate for the replication throughput which can be achieved with the setup –Input to experiment models for calibration / tag data flow Tests started on time, but progress was slower then planned –Main reasons Server setup problem (often db storage) at sites Firewall configuration DBA coverage during vacation period (several hires in the queue) Throughput optimization need Oracle experts to be involved

2. LCG 3D Status 14 June 2006 Eva Danfonte PerezStreams Throughput Tests2 Preliminary Results Condition-like workload  small (10 column) rows  10, 20 and 50 MB user data  Factor ~5 for DB log data Conclusions so far  Apply is the bottleneck  Parallelism helps!  Throttling (flow control) works  Queues size at destinations need appropriate size Regular contact with Patricia McElroy - Oracle Principal Product Manager Distributed Systems CERN to CERN CERN to CNAF

3. LCG 3D Status 14 June 2006 Eva Danfonte PerezStreams Throughput Tests3 Replication Throughput Online-Offline (LAN) Tier 0 - Tier 1 (WAN) ~ 10-100 MB/min achieved (little optimisation so far) Strong dependency on row size and commit frequency WAN reaches ~50% of LAN throughput

4. LCG 3D Status 14 June 2006 Eva Danfonte PerezStreams Throughput Tests4 Throughput vs Row Size Replication rate of 100 MB/s reached for 2kB rows

5. LCG 3D Status 14 June 2006 Eva Danfonte PerezStreams Throughput Tests5 LCR Rate/Volume vs Row Size LCR rate is almost constant (around 2k/sec) LCRs number in relation to the row size

6. LCG 3D StatusDirk Duellmann6 Frontier/SQUID Tests Stress tests with many clients at CERN to validate FroNTier and SQUID production setup at T0 –Obtained cached and un-cached client access rates –Maximum # of connections per server box –Validated DNS failover CMS Frontier tests at FNAL –Focus on connection retry and failover and CORAL integration –CMS July release may pickup LCG AA s/w release which is currently prepared Setting up an additional node for ATLAS FroNTier tests with COOL

7. LCG 3D Status 14 June 2006 Dirk DuellmannStreams Throughput Tests7 FroNTier Stress Tests