Lightweight Preservation Environment

1
Lightweight Preservation Environment

• Gary Jackson ltgaryj_at_umiacs.umd.edugt

2
Introduction

• The LPE is a prototype data grid built in
  conjunction with Fujitsu Labs of America
• In part, the LPE is a test bed for exercising
  Globus grid technologies
• An intention of the LPE is to preserve data. I
  will not be talking about the preservation
  measures today.

3
Globus Components

• The LPE is largely built on Globus Toolkit
  components
• Grid Security Infrastructure (GSI) and GSI
  interfaces
• Replica Location Service (RLS)
• Metadata Catalog Service (MCS)
• GridFTP

4
Implementation

• The implementation is based on GT3 and the Open
  Grid Services Infrastructure (OGSI)
• This infrastructure is being replaced with Web
  Services Resource Framework (WS-RF)

5
Implementation

• The LPE is implemented as a set of Grid Services
• This means each component has its own API that
  can be accessed through web-service remote
  procedure call

6
Implementation

• The Data Manager (DM) is the core of the LPE
• The Preservation Manager (PM) and Transform
  Manager (TM) handle preservation aspects
• The interface is servlet-based to talk natively
  to the DM

7
Lessons Learned

• Globus is flexible, but also complicated
• Some Globus components are fragile (MCS, RFT)
  while others are very solid and reliable (GSI
  interfaces, GridFTP)
• Globus is evolving and improving the
  implementation was made much better with
  subsequent toolkit releases