HPCwire: Taming the Data Deluge with the New iRODS Data Grid System

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February 08, 2008

Taming the Data Deluge with the New iRODS Data Grid System

by Paul Tooby

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Version 1.0 offers new generation of distributed data management power

Feb. 7 -- In the Information Age, the freedom to easily generate and share digital forms of information is driving life-changing advances in science and medicine, dramatic expansions in communications, big gains in business productivity, and a new flowering in video, music, and other cultural expressions.

At the same time, the digital data we all love is growing explosively. In 2006, humanity produced 161 exabytes of digital data -- that's 161 billion billion bytes, or 12 stacks of books stretching from the Earth to the Sun -- more data than our capacity to store it.

This deluge of data is bringing with it unprecedented challenges in organizing, accessing, sharing, and preserving digital information. To meet these challenges, the Data-Intensive Computing Environments (DICE) group at the San Diego Supercomputer Center (SDSC) at UC San Diego has released version 1.0 of iRODS, the Integrated Rule-Oriented Data System, a powerful new open-source approach to managing digital data.

"iRODS is an innovative data grid system that incorporates and moves beyond ten years of experience in developing the widely used Storage Resource Broker (SRB) technology," said Reagan Moore, director of the DICE group at SDSC. "iRODS equips users to handle the full range of distributed data management needs, from extracting descriptive metadata and managing their data to moving it efficiently, sharing data securely with collaborators, publishing it in digital libraries, and finally archiving data for long-term preservation."

The most powerful new feature, for which the Integrated Rule-Oriented Data System is named, is an innovative "rule engine" that lets users easily accomplish complex data management tasks. Users can automate enforcement, or "virtualize" data management policies by applying rules that control the execution of all data access and manipulation operations. Rather than having to hard code these actions or workflows into the software, the user-friendly rules let any group easily customize the iRODS system for their specific data management needs.

For example, when astronomers take new photographs in a sky survey and enter them into a data collection, the researchers can set up iRODS rules to automatically extract descriptive information and record it in the iRODS Metadata Catalog (iCAT), replicate a copy to another repository for backup, create a thumbnail for a Web-based gallery, and run an analysis program to identify related images.

An organization's archivist can configure iRODS rules to identify and retain a collection of digital records for five years, and then move them to another site or destroy them. And if someone requests these records, the archivist can confirm that the current digital copy is indeed an authentic copy of the original. iRODS rules are being developed that will validate the trustworthiness of digital repositories.

Users can apply the growing set of existing rules or write new ones. Rules can also be developed as community-wide policies to manage data.

"One reason policy-based data management is important is that it lets communities integrate across different types of collection structures," said Moore. "What this means is that iRODS lets one community talk to any other community independent of what data management system the other community is using. No matter which technology you pick you aren't isolated."

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