Jens G Jensen

Atlas Petabyte store

Supporting Multiple Interfacesto Mass Storage

Providing Tape and Mass Storage to Diverse Scientific Communities

Jens G Jensen

Atlas Petabyte store

Requirements

Data Management

Locate data

Retrieve data

Jens G Jensen

Atlas Petabyte store

Requirements

Analyse data on the Grid

Dual access – Grid andnon-Grid

Jens G Jensen

Atlas Petabyte store

Requirements

CurationLong term storage and archival

Jens G Jensen

Atlas Petabyte store

Requirements

Very largevolumes

Very largereal-timedata rates

Jens G Jensen

Atlas Petabyte store

Requirements

Recover data in emergency

= backup

Jens G Jensen

Atlas Petabyte store

What is Atlas?

• 1.2 Petabyte capacity• Tape• STK Powderhorn• Interfaces, services

Jens G Jensen

Atlas Petabyte store

What is Atlas?

• 1.2 Petabyte capacity• Tape• STK Powderhorn• Interfaces, services• New robot coming in

Jens G Jensen

Atlas Petabyte store

We support – Grid protocols

• SRB

– Data management interface

– Metadata, data

• SRM

– Built for very large data volumes

– Very high transfer rates via GridFTP

Jens G Jensen

Atlas Petabyte store

What is the Grid?

Distributed computing

Distributed collaborations

and Virtual Organisations

Jens G Jensen

Atlas Petabyte store

What is the Grid?

Access is brokered

job

Data is replicated

Jens G Jensen

Atlas Petabyte store

What is the Grid?Well defined protocols (sort of)

• File access• Information providers• Job submission• Security

Jens G Jensen

Atlas Petabyte store

Grid Architecture, SRB

Atlas

SRBScientist

Jens G Jensen

Atlas Petabyte store

Grid Architecture, SRB

Atlas

LocalSRB

Scientist

Group files into container

Slow network

Fast network

Store container

Remote SRB

Jens G Jensen

Atlas Petabyte store

Grid Architecture, SRM

Storage Element(SRM)

File Transfer Service

Replica Manager

Replica Catalogue

ApplicationInformation

Services

Components fit togetherto provide Grid servicesAtlas

Jens G Jensen

Atlas Petabyte store

We support – non-Grid protocols

TapeDisk cache

vtp, rfio, dcap,…

Jens G Jensen

Atlas Petabyte store

Who are the customers

GridPP Tier 1

CCLRC facilities

Research councils

e-Science projects

Jens G Jensen

Atlas Petabyte store

Who are the customers

Small – a few gigabytes

To large – hundreds ofTerabytes

Different customers drivedifferent areas of service

Be all things to all people?

Jens G Jensen

Atlas Petabyte store

Community

User group meetings

Helpdesk

How to tie the communitytogether?

Jens G Jensen

Atlas Petabyte store

Conclusions

• Supporting multiple communities via multiple interfaces– Grid interfaces and non-Grid– Multiple requirements

• Diversity is good – (up to a point?)– Volume and rates driven by GridPP– Metadata driven by e-Science projects

and RCUK