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An Architectural Approach to Managing Data in Transit. Micah Beck Director & Associate Professor Logistical Computing and Internetworking Lab Computer Science Department University of Tennessee DOE Data Management Workshop 3/17/2004. “Data in Transit”.

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An architectural approach to managing data in transit

An Architectural Approach to Managing Data in Transit

Micah Beck

Director & Associate Professor

Logistical Computing and Internetworking Lab

Computer Science Department

University of Tennessee

DOE Data Management Workshop 3/17/2004

Data in transit
“Data in Transit”

  • After being generated by an instrument or supercomputer

  • Not stored in a permanent archive

  • Serving the diverse purposes of a community of users and applications

  • Being transferred, processed and stored to meet changing and unanticipated needs

    • Visualization

    • Data Mining

    • Collaboration

    • Distributed Computing

Interoperability via a common interface
Interoperability via a Common Interface

  • Span heterogeneous physical resources, operating systems, local management schemes

  • Serve changing and unexpected application requirements; enable application autonomy

  • We measure success in terms of infrastructuredeployment scalability

    • In networks and distributed systems, this means number, distribution, global reach, spanning administrative domains…

    • The Internet is the gold standard of infrastructure deployment scalability

Layering as an architectural approach
Layering as An Architectural Approach

  • Abstractions at each layer can hide differences at lower layers

  • Exposed approaches avoid creating overly complex mechanisms at lower layers

  • The E2E Principle: Attributes of lower layers implemented on shared infrastructure enable deployment scalability

    • Generality: Serve diverse application needs, model diverse lower layer resources

    • Weak semantics: Don’t give too much away at one time!

The ip network stack
The IP Network Stack



common interface (IP)




Ip s failure of scalability
IP’s Failure of Scalability

  • Today, IP is failing as a common interface

  • The design of IP is out of date

    • Application communities are more diverse

    • Link layer technologies violate IP assumptions

  • Application communities are defining their own common interfaces for general resource sharing, deploying their own infrastructure (e.g. the Grid)

  • Some networking communities have abandoned interoperability at the network layer between widely divergent link layer technologies (e.g. optical switching & IP)

The transit layer a new location for interoperability
The Transit Layer: A New Location for Interoperability

  • Expand the link layer to a local layer to model transfer, storage and processing resources

  • Insert a new transit layer between the local and network layers to implement a common interface to diverse technologies at the local layer

  • Adopt a highly general common interface at the transit layer, providing a uniform view of all of the resources of the network node

  • Build diverse network services on top of this common interface to model diverse application requirements

  • “Locating Interoperability in the Network Stack”, Micah Beck & Terry Moore, UT-CS-04-520, Univ. of TN CS Dept Tech Rpt

The transit network stack
The Transit Network Stack




common interface







Transit networking a unified view
Transit Networking: A Unified View

“… memory locations … are just wires turned sideways in time”

Dan Hillis, 1982,Why Computer Science is No Good

Logistical networking an overlay implementation of the transit layer
Logistical Networking: An Overlay Implementation of the Transit Layer

  • Logistical Networking is an overlay implementation of transit layer functionality built on top of the IP network

  • The Internet Backplane Protocol is the common transit layer interface for Logistical Networking

  • Network nodes are IBP “depots” that run as user level processes, communicate using TCP/IP as well as other link and network layer protocols

  • Depots also serve storage and processing resources to Logistical Networking clients

Ln tools and deployment
LN Tools and Deployment Transit Layer

  • The Logistical Runtime System (LoRS) is a set of tools based on IBP that enable users to take advantage of the resources of IBP depots

  • Logistical Distribution Network (LoDN) is a data directory, monitoring and management system

  • The Logistical Backbone is a Resources Discovery service and global experimental IBP testbed

    • Over 35 TB of storage available

    • Over 300 depots in 21 countries

    • Leverages the resources of PlanetLab

  • Additional depots deployed at ORNL & NERSC

Example ln applications
Example LN Applications Transit Layer

  • Astrophysics: Terascale Supernova Initiative (A. Mezzacappa, ORNL; J. Blondin, NCSU)

    • Management of massive datasets

  • Fusion Energy Research (S. Klasky, PPPL)

    • Streaming of simulation data during generation

  • Viewset-Based Visualization

    • Prestaging & caching of distant data

  • Content Distribution

    • Heroic data distribution problems (Linux ISOs)

  • Multimedia Networking

    • Creation, mgt & delivery of high value content

Ln futures and directions
LN Futures and Directions Transit Layer

  • Storage

    • Implementation of file system services

    • Moving data through firewalls at line speed

    • QoS in highly controlled environments

  • Networking

    • Interoperability at ultrascale

    • Advanced services (e.g. multicast)

  • Computation

    • Offloading visualization to IBP depots

    • Developing sets of operations to support application communities

Thank you! Transit Layer