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Digital Preservation and Archiving at the Institute for Advanced Computer Studies University of Maryland, College Park. Mike Smorul Saurabh Channan. Overview. Digital Preservation Research ADAPT Project and Components Pilot Persistent Archive - PowerPoint PPT Presentation
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Mike Smorul
Saurabh Channan
Digital Preservation and Archiving at the
Institute for Advanced Computer StudiesUniversity of Maryland, College Park
Overview
• Digital Preservation Research– ADAPT Project and Components– Pilot Persistent Archive
• Digital Library and Production Data Distribution– Global Land Cover Facility
• Conclusion & Questions
A Digital Approach to Preservation Technology (ADAPT)
• Premise:– Preservation of digital entities into self-
describing objects• OAIS Information Packet model as a framework
– Separation of management into three layers, bitstream, semantic, and access/discovery
– Distributed and Secure Infrastructure• Automatic ingestion and replication• Policy-Driven Management of Preservation
Processes• Global Format Registry• Separate Peer-to-Peer Deep Archive
ADAPT Architecture
Data Management
Metadata Management
Descriptive Metadata
Preservation Metadata
Administrative Metadata
Deep Archive Data GridConventional
Archive
PAWN
Met
adat
a
Data
CAN
Management of Preservation Processes
ADAPT Components• Ingestion
– Producer-Archive Workflow Network (PAWN)
• Management of Preservation Processes– Lightweight Preservation Environment (LPE)
• Access and Discovery– Grid Retrieval and Search Platform (GRASP)– EAP Collection browser
Overall Principles (PAWN)
• Distributed, secure ingestion• OAIS based Information Packet creation• Use of web/grid technologies – platform
independent• Minimal client-side requirements• Ease of integration with archive and data grid
systems.• Designed to satisfy data integrity requirements
of scientific collections and digital preservation
Distributed Ingestion (PAWN)
``
`
Producer
``
`
Producer
``
`
Producer
``
`
Producer
Distributed Archive
Ingestion Workflow (PAWN)
1. Negotiate Submission Agreement.
2. Workflow Initialization and Submission Information Packet (SIP) creation.
3. Transfer of SIPs to Data Grid site.
4. Validation of SIP transfer
5. Organization of data into collections and transfer into Data Grid.
Component Overview (PAWN)
CRL check
Success/Failure notification of ingestion
Metadata registration/retrieval
Producer Management Interface Data Grid Management Interface
Producer data suppliersBitstream Validation Service
Data Grid
Target Collections (PAWN)
• Digital Image Collection– Rich metadata in various formats
• Web site crawling– Online and interactive content
• GLCF Landsat data– Spatial and temporal metadata– Large quantity (over 15,000 objects)
•The Lightweight Preservation Environment is an archival system based on a modular design using grid and web services.
•The current implementation relies mostly on Globus technologies.
•Primarily, we’ve focused on wrapping logic around those components.
Lightweight Preservation Environment (LPE)
Developed Components (LPE)
•Data Manager (DM):Organizes data and queries between the user and the other components
•Policy Manager (PM):Ensures that a minimum number of copies exist for any given file
•Transformation Manager (TM):Executes specific transformations on a named file on a given storage node and returns the results
Grid Retrieval and Search Platform (GRASP)
• Based on concepts developed in the Earth Science Data Interface (ESDI) developed at the UMIACS GLCF.
• Provides a graphical interface into data grid holdings.
• Access to entire GLCF holdings through the Storage Resource Broker(SRB)
GRASP Architecture
I/O Abstraction Layer
Data Grid
Clients
Data download
Query Abstraction
Browse / Display
Spatial Information
Textual Information
Data Discovery
GRASP Architecture
• GRASP uses a data grid as an abstract storage repository.
• Metadata in the grid is mined from the grid itself or from external sources and published into a browsable form.– Data grids may allow for platform independent
metadata, but may not be optimal for access
GRASP Screenshot
Global Land Cover Facility• Mission:
“The GLCF Mission is to encourage the use of remotely sensed imagery, derived products and applications within a broad range of science communities in a manner that improves comprehension of the nature and causes of land cover change and its impact on the Earth.”
• Goal:“The GLCF Goal is to provide free access to an integrated
collection of critical land cover and Earth science data through systems that are designed to maximize user outreach and that promote development of novel tools for ordering, visualizing and manipulating spatial data.”
Data Collections
Majority of the holdings are of Landsat and MODIS data
Data Distribution
• Data at the GLCF– Approximately 5.1 TB
compressed– Approximately 13 TB
uncompressed
• Anticipated Production Rate– Triple or Quadruple current
data holding within the next two year
Data Traffic
0
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
Month
Meg
abyt
es
Data Discovery Applications
ESDI
Web Interface
User friendly
Search
Retrieve
Discover
Scalable
Over 9TB a month !
GLCF Archive
SunFire V100
Sun
SunFire V100
SunSunFire V100
Sun
SunFire V100
Sun
SunFire V100
Sun
SunFire V100
Sun
SunFire V100
Sun
SunFire V100
Sun
ProFTPd servers
File ServersRAIDs
ftp://ftp.glcf…./../something.tif
SunFire V100
Sun
SunFire V100
Sun
SunFire V100
Sun
Scalable and Reliable
Participation Possibilities
• PAWN ingestion component– Minimal geospatial metadata support planned, can be
expanded to support NGDA endpoint
• GRASP display component– Solid core components, end-user interfaces need
additional polishing
• GLCF data holdings– Additional hardware required if additional data and
access mechanisms (grid, etc) required
• Other possibilities include: grid infrastructure, GSI security, format registry, etc.
Questions