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US LFC Centralization - PowerPoint PPT Presentation

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US LFC Centralization

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  1. US LFC Centralization • Plans • US has 9 LFCs currently. • All T2s and T3s LFC will be consolidated. • Target date for the completion is by the end of Sept 2012 • Consolidated LFC • ust2lfc.usatlas.bnl.gov • Multiple head nodes behind F5 • Oracle backend

  2. Technical detail • All US T2s use LFC with MySQL backend • Data is migrated continuously to BNL MySQL via rubyrep • To reduce the site downtime. Less than one day. • MySQL Dump is used in the case where direct access to the backend MySQL from BNL is not possible. • From BNL’s MySQL, the content is inserted to T2 LFC BNL. • The volume at each LFC is between a few millions and 10 millions replicas.

  3. LFC dump • T2 admin has ability to request the LFC dump via http://www.usatlas.bnl.gov/dq2/lfcdumprequests/index • The request is automatically processed • produce the dump in sqlite format. • The dump is registered to DDM as a dataset and subscribed to a requested site

  4. Site cleanup • There is a script to clean-up/check the site storage. • Compare the LFC dump with the physical files from the storage. • Will be used to cleanup Panda Mover files