CEA Releases Robinhood 2.5

December 20, 2013

Dec. 20 — The Military Applications Department of the French Atomic Energy Commission (CEA/DAM) has developed since 2006 a policy engine named “Robinhood,” to deal with the growing amount of data and metadata on its HPC filesystems.

Robinhood Policy Engine is a Swiss-army knife to manage large filesystems. It integrates many data management features such as access monitoring, accounting, scheduling of massive data operations like data archiving, cleaning unused data…

With this new 2.5 version, Robinhood adds new strings to its bow: it implements disaster recovery features that allow rebuilding filesystem metadata after a major corruption. It also supports the latest new features in filesystems, by implementing an automatic scheduling of data movements for Lustre 2.5 HSM.

This tool is available as an Open Source Software on sourceforge since 2009. It has a constantly growing popularity in the world of HPC filesystems especially in sites using Lustre (see: http://robinhood.sourceforge.net).

Robinhood is also integrated by several vendors in their storage solutions.

Robinhood core: a filesystem metadata replicate that can be updated near real-time

The core component of Robinhood is a database that constitutes a filesystem metadata replicate and is optimized to ingest information at a high-rate. This database can be populated by performing filesystem namespace scanning, which is made efficient thanks to a massively multi-threaded traversal algorithm.

Even better, the database can be updated by reading incremental changes from the filesystem, which offers significant benefits:

  •  this is much more efficient as it removes the need for scanning the namespace, which is a long operation on large filesystems.
  •  contents of the database are updated near real-time which allow providing  fresher information than any other statistics or monitoring tool.

In particular, this second method is possible with Lustre v2 filesystems as they implement a transactional ChangeLog mechanism  to keep an external application updated about filesystem changes.

Get rid of your old-fashioned scripts…

Using this metadata replicate, robinhood allows searching for entries using various criteria much more efficiently than using traditional UNIX tools like ‘find.’

By the way, it provides clones of these commands (rbh-find, rbh-du) to allow fast queries without changing administrators habits. Another interest of those commands is to offload the filesystem from an usual metadata traffic, thus releasing resources for data production.

The SQL language of the database engine also makes it very easy to aggregate information and extract customized statistics for the millions or billions of entries in the filesystem, in a very short time. Last but not least, the database contents are used by robinhood policy modules to schedule massive actions on filesystem entries, based on customizable criteria on file attributes, path, extended attributes…

With all these features, Robinhood Policy Engine can usefully replace bunches of home-made scripts that all do the same expensive namespace traversal in order to perform their job: scan the namespace to search for entries, scan the namespace to get statistics, scan the namespace to execute actions on entries…

Policy management

Robinhood Policy Engine – as its name reminds us – was first designed to massively schedule actions on filesystem entries: schedule data movements between a filesystem and a long-term storage system, perform space cleaning on a temporary filesystem when it gets full…

Its flexible policy language allows defining arbitrary file classes based on entry attributes, and applying different policies to the file classes (e.g. archive some files quickly than others, never purge some other files…). Policy actions are performed in parallel by pool of worker threads, which results in a high speed of execution.

With its policy management capabilities, its long experience in managing mass data movements, and a particular support of Lustre specific features (changelogs, striping, OST pools, fids…), Robinhood is a favorite choice as a policy engine for Lustre 2.5 HSM.

Future directions

A short-term concern in Robinhood development is to make it more generic and dynamic, by implementing a framework of dynamically loaded modules. This will allow filesystem administrators to schedule any kind of actions (data integrity scrubbing, Lustre OST re-balancing…), possibly using their own criteria, not necessarily using built-in conditions.

In the mid-term, the challenge for this software is to deal with metadata parallelism. Indeed, a general trend in filesystems is to parallelize the metadata service (like in Lustre with DNE) which results in multiplying the load on a metadata auxiliary service like Robinhood. This could possibly be addressed by integrating Big Data technologies like NoSQL databases.

About the CEA

The French Alternative Energies and Atomic Energy Commission (CEA) leads research, development and innovation in four main areas: low-carbon energy sources, global defense and security, information technologies and healthcare technologies. The CEA’s leadership position in the world of research is built on a cross-disciplinary culture of engineers and researchers, ideal for creating synergy between fundamental research and technology innovation. With its 15,600 researchers and collaborators, it has internationally recognized expertise in its areas of excellence and has developed many collaborations with national and international, academic and industrial partners.

—–

Source: CEA

Subscribe to HPCwire's Weekly Update!

Be the most informed person in the room! Stay ahead of the tech trends with industy updates delivered to you every week!

Fluid HPC: How Extreme-Scale Computing Should Respond to Meltdown and Spectre

February 15, 2018

The Meltdown and Spectre vulnerabilities are proving difficult to fix, and initial experiments suggest security patches will cause significant performance penalties to HPC applications. Even as these patches are rolled o Read more…

By Pete Beckman

Intel Touts Silicon Spin Qubits for Quantum Computing

February 14, 2018

Debate around what makes a good qubit and how best to manufacture them is a sprawling topic. There are many insistent voices favoring one or another approach. Referencing a paper published today in Nature, Intel has offe Read more…

By John Russell

Brookhaven Ramps Up Computing for National Security Effort

February 14, 2018

Last week, Dan Coats, the director of Director of National Intelligence for the U.S., warned the Senate Intelligence Committee that Russia was likely to meddle in the 2018 mid-term U.S. elections, much as it stands accused of doing in the 2016 Presidential election. Read more…

By John Russell

HPE Extreme Performance Solutions

Safeguard Your HPC Environment with the World’s Most Secure Industry Standard Servers

Today’s organizations operate in an environment with ever-evolving threats, and in order to protect themselves they must continuously bolster their security strategy. Hewlett Packard Enterprise (HPE) and Intel® are addressing modern security challenges with the world’s most secure industry standard servers powered by the latest generation of Intel® Xeon® Scalable processors. Read more…

AI Cloud Competition Heats Up: Google’s TPUs, Amazon Building AI Chip

February 12, 2018

Competition in the white hot AI (and public cloud) market pits Google against Amazon this week, with Google offering AI hardware on its cloud platform intended to make it easier, faster and cheaper to train and run machi Read more…

By Doug Black

Fluid HPC: How Extreme-Scale Computing Should Respond to Meltdown and Spectre

February 15, 2018

The Meltdown and Spectre vulnerabilities are proving difficult to fix, and initial experiments suggest security patches will cause significant performance penal Read more…

By Pete Beckman

Brookhaven Ramps Up Computing for National Security Effort

February 14, 2018

Last week, Dan Coats, the director of Director of National Intelligence for the U.S., warned the Senate Intelligence Committee that Russia was likely to meddle in the 2018 mid-term U.S. elections, much as it stands accused of doing in the 2016 Presidential election. Read more…

By John Russell

AI Cloud Competition Heats Up: Google’s TPUs, Amazon Building AI Chip

February 12, 2018

Competition in the white hot AI (and public cloud) market pits Google against Amazon this week, with Google offering AI hardware on its cloud platform intended Read more…

By Doug Black

Russian Nuclear Engineers Caught Cryptomining on Lab Supercomputer

February 12, 2018

Nuclear scientists working at the All-Russian Research Institute of Experimental Physics (RFNC-VNIIEF) have been arrested for using lab supercomputing resources to mine crypto-currency, according to a report in Russia’s Interfax News Agency. Read more…

By Tiffany Trader

The Food Industry’s Next Journey — from Mars to Exascale

February 12, 2018

Global food producer and one of the world's leading chocolate companies Mars Inc. has a unique perspective on the impact that exascale computing will have on the food industry. Read more…

By Scott Gibson, Oak Ridge National Laboratory

Singularity HPC Container Start-Up – Sylabs – Emerges from Stealth

February 8, 2018

The driving force behind Singularity, the popular HPC container technology, is bringing the open source platform to the enterprise with the launch of a new vent Read more…

By George Leopold

Dell EMC Debuts PowerEdge Servers with AMD EPYC Chips

February 6, 2018

AMD notched another EPYC processor win today with Dell EMC’s introduction of three PowerEdge servers (R6415, R7415, and R7425) based on the EPYC 7000-series p Read more…

By John Russell

‘Next Generation’ Universe Simulation Is Most Advanced Yet

February 5, 2018

The research group that gave us the most detailed time-lapse simulation of the universe’s evolution in 2014, spanning 13.8 billion years of cosmic evolution, is back in the spotlight with an even more advanced cosmological model that is providing new insights into how black holes influence the distribution of dark matter, how heavy elements are produced and distributed, and where magnetic fields originate. Read more…

By Tiffany Trader

Inventor Claims to Have Solved Floating Point Error Problem

January 17, 2018

"The decades-old floating point error problem has been solved," proclaims a press release from inventor Alan Jorgensen. The computer scientist has filed for and Read more…

By Tiffany Trader

Japan Unveils Quantum Neural Network

November 22, 2017

The U.S. and China are leading the race toward productive quantum computing, but it's early enough that ultimate leadership is still something of an open questi Read more…

By Tiffany Trader

AMD Showcases Growing Portfolio of EPYC and Radeon-based Systems at SC17

November 13, 2017

AMD’s charge back into HPC and the datacenter is on full display at SC17. Having launched the EPYC processor line in June along with its MI25 GPU the focus he Read more…

By John Russell

Researchers Measure Impact of ‘Meltdown’ and ‘Spectre’ Patches on HPC Workloads

January 17, 2018

Computer scientists from the Center for Computational Research, State University of New York (SUNY), University at Buffalo have examined the effect of Meltdown Read more…

By Tiffany Trader

IBM Begins Power9 Rollout with Backing from DOE, Google

December 6, 2017

After over a year of buildup, IBM is unveiling its first Power9 system based on the same architecture as the Department of Energy CORAL supercomputers, Summit a Read more…

By Tiffany Trader

Nvidia Responds to Google TPU Benchmarking

April 10, 2017

Nvidia highlights strengths of its newest GPU silicon in response to Google's report on the performance and energy advantages of its custom tensor processor. Read more…

By Tiffany Trader

Fast Forward: Five HPC Predictions for 2018

December 21, 2017

What’s on your list of high (and low) lights for 2017? Volta 100’s arrival on the heels of the P100? Appearance, albeit late in the year, of IBM’s Power9? Read more…

By John Russell

Russian Nuclear Engineers Caught Cryptomining on Lab Supercomputer

February 12, 2018

Nuclear scientists working at the All-Russian Research Institute of Experimental Physics (RFNC-VNIIEF) have been arrested for using lab supercomputing resources to mine crypto-currency, according to a report in Russia’s Interfax News Agency. Read more…

By Tiffany Trader

Leading Solution Providers

Chip Flaws ‘Meltdown’ and ‘Spectre’ Loom Large

January 4, 2018

The HPC and wider tech community have been abuzz this week over the discovery of critical design flaws that impact virtually all contemporary microprocessors. T Read more…

By Tiffany Trader

Perspective: What Really Happened at SC17?

November 22, 2017

SC is over. Now comes the myriad of follow-ups. Inboxes are filled with templated emails from vendors and other exhibitors hoping to win a place in the post-SC thinking of booth visitors. Attendees of tutorials, workshops and other technical sessions will be inundated with requests for feedback. Read more…

By Andrew Jones

How Meltdown and Spectre Patches Will Affect HPC Workloads

January 10, 2018

There have been claims that the fixes for the Meltdown and Spectre security vulnerabilities, named the KPTI (aka KAISER) patches, are going to affect applicatio Read more…

By Rosemary Francis

GlobalFoundries, Ayar Labs Team Up to Commercialize Optical I/O

December 4, 2017

GlobalFoundries (GF) and Ayar Labs, a startup focused on using light, instead of electricity, to transfer data between chips, today announced they've entered in Read more…

By Tiffany Trader

Tensors Come of Age: Why the AI Revolution Will Help HPC

November 13, 2017

Thirty years ago, parallel computing was coming of age. A bitter battle began between stalwart vector computing supporters and advocates of various approaches to parallel computing. IBM skeptic Alan Karp, reacting to announcements of nCUBE’s 1024-microprocessor system and Thinking Machines’ 65,536-element array, made a public $100 wager that no one could get a parallel speedup of over 200 on real HPC workloads. Read more…

By John Gustafson & Lenore Mullin

Flipping the Flops and Reading the Top500 Tea Leaves

November 13, 2017

The 50th edition of the Top500 list, the biannual publication of the world’s fastest supercomputers based on public Linpack benchmarking results, was released Read more…

By Tiffany Trader

V100 Good but not Great on Select Deep Learning Aps, Says Xcelerit

November 27, 2017

Wringing optimum performance from hardware to accelerate deep learning applications is a challenge that often depends on the specific application in use. A benc Read more…

By John Russell

SC17: Singularity Preps Version 3.0, Nears 1M Containers Served Daily

November 1, 2017

Just a few months ago about half a million jobs were being run daily using Singularity containers, the LBNL-founded container platform intended for HPC. That wa Read more…

By John Russell

  • arrow
  • Click Here for More Headlines
  • arrow
Share This