Transactional Grid Deployment

1
Transactional Grid Deployment

• Geoff Quigley, Brian Coghlan, John Walsh, David
  OCallaghan, Stephen Childs and Eamonn Kenny

2
Overview

• Grid-Ireland
• Need for Transactional Deployment
• Design and implementation
• Infrastructure availability

3
Grid-Ireland

• Irish National Computational Grid
• 6 sites now, 17 sites by Feb05
• Production environment
• LCG-2.2.0 Middleware
• Grid Operations Centre in TCD
• Homogeneous infrastructure
• Grid-Ireland owns infrastructure
• Heterogeneous compute resources
• Sites own their resources

4
Grid-Ireland Infrastructure

• Infrastructure grid gateway per site
• Gateway fw/LCFG/CE/SE/UI/MON/NM
• LCFGng used to manage gateway
• Install/maintain the correct packages
• Configure some software
• LCFGng can be used to maintain site
• Sites mostly do not use the gateway LCFG to
  manage their resources (WNs)

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Why Transactional?

• Quickly move the whole infrastructure between
  consistent states
• 2-phase transactions prepare commit
• Commit can be very quick
• Changes can be rolled back
• Automation reduces deployment errors
• Increases availability of infrastructure

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Transactional Deployment

• Distributes profiles, RPMs and RPM lists to
  LCFGng servers
• Automates the building of new profiles
• Detects errors
• Has rollback capability
• Automatically rollback if deployment fails
• Option to rollback successful deployments

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Architecture
8
Web Client
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Deployment Delay s

• Delay in sites deploying release
• Shown here for CrossGrid production and
  development testbeds
• MTTCMean Time To Consistency

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Release Intervals

• MTBRMean Time Between Releases
• Availability
• AMTBR/(MTBRMTTC)
• A 94 prod.TB
• A 87 dev.TB
• Too early to measure availability with
  transactional deployment

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Current Status

• We estimate availability of the core
  infrastructure increases to gt99.8
• Transactional Deployment under intensive
  test/evaluation on Grid-Ireland
• Automation reduces errors
• Very easy to use
• Intend to extend to include Quattor