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Replica Optimization Service - ROS - Optor
The Replica Optimization Service is an internal service component of the
WP2 Replica Management Services. Currently it only implements short-term-optimization
as described here. ROS depends on two underlying
services:
- The network monitoring services by WP7 to determine the estimated
cost for file transfer over the WAN.
- The WP5 Storage Element SE to determine the access cost for
a specified file, i.e. how much time it takes to make the data accessible.
The SE may have various mass storage media underneath where the data
resides and depending on what kind of media the file is on (tape, CDROM,
disk) it may take some time to prepare (stage) the file for access.
Based on these access time estimators ROS will choose the 'best' replica
among many as a function of the accessing site. For more detail, see
Presentations given on Optor
- (ppt)
November 2003, Access Cost Estimation for Unified Grid Storage Systems,
International Workshop on Grid Computing (Grid2003), Phoenix, AZ
- (ppt)
September 2003, Advanced Replica Management with Reptor, International
Conference on Parallel Processing and Applied Mathematics, Czestochowa,
Poland
- (ppt)
13/02/03 Optor - Replica Optimisation Service, CERN, Geneva,
Switzerland
- (ppt)
30/8/02 Replica Optimisation: OptorSim vs. Optor, WP2 Workshop,
CERN, Geneva, Switzerland
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CVS repository
