About SAND

The SAND project coordinates network monitoring and diagnostics from over a hundred application-level measurement points and aggregates them into a measurement archive. This curated measurement archive provides access to historical and quasi-real-time network performance data, allowing for higher-level diagnastics and analyses.

SAND supports and collaborates with long-running activities such as the OSG-Networking area and the WLCG Throughput working group. The data collected by each of these projects goes into the SAND Network Monitoring Archive (SAND-NMA).

SAND maintains a map of CC* sites running perfSONAR; to allow your site to show up, follow these directions.

IRIS-HEP Summer 2020 Fellowship Presentations

Sample packet loss graph

Packet Loss Tracking

Sample packet loss graph from the SAND archive

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Sample TCP throughput graph

Throughput Tracking

SAND’s archives record historical single-stream TCP across many links

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Traceroute Dashboard

Traceroute Tracking

SAND’s archives record historical traceroutes throughout many links

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MEPHi TRACER (traceroute explorer)


Interactive Traceroute explorer

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PS-Dash App

PS-Dash App

OSG-LHC/WLCG network metrics summary, site rankings, and highlighted problem pairs

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SAND Network Monitoring Archive

The SAND-NMA aims to aggregate as much network monitoring tests results as feasible, providing a knowledgebase for debugging networks and performing data analytics. This archive consists of a data collector (polling measurement endpoints), a message bus (which endpoints can also push data into directly), an archive, and a visualization platform, as pictured here:

SAND-NMA Architecture

SAND-NMA Architecture

Currently, we are recording network measurements from perfSONAR and HTCondor file transfer; we plan to extend this to XRootD services during 2020.

A few metrics about our service:

  • SAND users: Engaged BNL (ATLAS), AGLT2 (ATLAS), MWT2 (ATLAS), UCSD (CMS), Nebraska (CMS), Wisconsin (CMS), MIT (CMS), and Purdue (CMS), all within the last year, to identify and resolve network issues
  • Number of data sources: 236 distinct perfSONAR endpoints
  • Number of HTCondor submit hosts reporting network measurements: 19
  • Number of distinct measurements in the ElasticSearch database: over 10 billion, from February 28, 2018 to present

Contact us

SAND has a weekly meeting for collaborators and project members:

When Monday, 3:00–4:00 p.m. Central Time
Online https://unl.zoom.us/j/344520180
Phone +1 646 876 9923,or +1 669 900 6833, Meeting ID: 344 520 180

Additionally, we can be reached via our public Google Group.