Transcript LPE.ppt
Lightweight
Preservation
Environment
Gary Jackson
<[email protected]>
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.
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
Implementation
The implementation is based on GT3 and
the Open Grid Services Infrastructure
(OGSI)
This infrastructure is being replaced with
Web Services Resource Framework (WSRF)
Implementation
The LPE is implemented as a set of Grid
Services
This means each component has it’s own
API that can be accessed through webservice remote procedure call
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
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