1. Transactional Grid Deployment
Geoff Quigley*, Brian Coghlan, John Walsh, David O’Callaghan, Stephen Childs and Eamonn Kenny

2. Grid-Ireland Transactional Deployment
Overview
Grid-Ireland
Need for Transactional Deployment
Design and implementation
Infrastructure availability
December 2004
Grid-Ireland Transactional Deployment

3. Grid-Ireland Transactional Deployment
Irish National Computational Grid
6 sites now, 17 sites by Feb’05
Production environment
LCG Middleware
Grid Operations Centre in TCD
Homogeneous infrastructure
Grid-Ireland owns infrastructure
Heterogeneous compute resources
Sites own their resources
December 2004
Grid-Ireland Transactional Deployment

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)
In Grid Ireland we are actually using an EDG version of LCFGng.
December 2004
Grid-Ireland Transactional Deployment

5. Grid-Ireland Transactional Deployment
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
December 2004
Grid-Ireland Transactional Deployment

6. 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
December 2004
Grid-Ireland Transactional Deployment

7. Grid-Ireland Transactional Deployment
Architecture
December 2004
Grid-Ireland Transactional Deployment

8. Grid-Ireland Transactional Deployment
Web Client
December 2004
Grid-Ireland Transactional Deployment

9. Grid-Ireland Transactional Deployment
Deployment Delay s
Delay in sites deploying release
Shown here for CrossGrid production and development testbeds
MTTC=Mean Time To Consistency
December 2004
Grid-Ireland Transactional Deployment

10. Grid-Ireland Transactional Deployment
Release Intervals
MTBR=Mean Time Between Releases
Availability:
A=MTBR/(MTBR+MTTC)
A = 94% [prod.TB]
A = 87% [dev.TB]
Too early to measure availability with transactional deployment
December 2004
Grid-Ireland Transactional Deployment

11. Grid-Ireland Transactional Deployment
Current Status
We estimate availability of the core infrastructure increases to >99.8%
Transactional Deployment under intensive test/evaluation on Grid-Ireland
Automation reduces errors
Very easy to use
Intend to extend to include Quattor
5 mins to see change + time to update
Will try to be involved in community effort on Quattor
- if necessary will put the transactional deploy stuff into Quattor rather than the other way around
December 2004
Grid-Ireland Transactional Deployment