24-28 October 2011
Hosted by TRIUMF, SFU and the University of Victoria at the Harbour Center - Downtown Vancouver
Canada/Pacific timezone

A highly distributed, petascale migration from dCache to HDFS

27 Oct 2011, 11:00
30m
Hosted by TRIUMF, SFU and the University of Victoria at the Harbour Center - Downtown Vancouver

Hosted by TRIUMF, SFU and the University of Victoria at the Harbour Center - Downtown Vancouver

515 West Hastings Street Vancouver, BC Canada V6B 5K3
Storage & Filesystems Storage & File Systems

Speaker

Mr. William Maier (University of Wisconsin (US))

Description

The University of Wisconsin CMS Tier-2 center serves nearly a petabyte of storage and tens of thousands of hours of computation each day to the global CMS community. After seven years, the storage cluster had grown to 250 commodity servers running both the dCache distributed filesystem and the Condor batch scheduler. This multipurpose, commodity approach had quickly and efficiently scaled to meet growing analysis and production demands. By 2010, when alternatives to dCache became available in the CMS community, the center was ready to test alternatives that might be a better fit for its hybrid model. HDFS had become widely accepted in the web world and was designed to run in a similarly mixed storage and execution environment. In early evaluations, it performed as well as dCache while also reducing the operational burden. So, in the spring of 2011, the center successfully migrated all of its production data to HDFS with only a few hours downtime. This migration was one of the largest to date within the CMS community. A unique and highly distributed mechanism was developed to complete the migration while maximizing availability of data to the thousands of jobs that run at Wisconsin each day. This talk presents the migration technique and evaluates its strengths, weaknesses and wider applicability as peers within the CMS community embark on their own migrations.

Primary authors

Dr. Ajit Mohapatra (University of Wisconsin (US)) Mr. Dan Bradley (University of Wisconsin (US)) Dr. Sridhara Dasu (University of Wisconsin (US)) Mr. William Maier (University of Wisconsin (US))

Presentation Materials

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