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O2 is a platform for Linux-based high performance computing at Harvard Medical School. The name is derived from being the next generation of the HMS "Orchestra" cluster, hence "O"2.

  • O2 is managed by the Research Computing Group, part of HMS IT.

  • O2 is an HPC cluster built on Linux and the Slurm open source job scheduler.

  • Please submit a request for O2 help or feedback.

  • Follow us on Twitter for updates and alerts about service outages.

Getting Started with O2 and Slurm

O2 Portal

  • Access to O2 via a web browser; powered by Open OnDemand

  • Simplify transfer to/from O2 and the interaction of popular tools/applications

O2 Jobs and the Slurm scheduler

Software and Programming on O2

General UNIX Information

Data Storage

Cluster Status


Our O2 Cluster Status has details of service outages and planned maintenance.

Community Events

User Training

  • Classes are offered each semester to the HMS community to help you ramp up your research skills!

  • Please check the User Training page for courses, dates, and registration

Office Hours

  • RC's Office Hours are held every Wednesday, 1 - 3 PM.

    • As part of the HMS response to COVID-19, office hours are being held online, using Zoom.

    • During these hours only, you can join the Zoom meeting room for a consultation. 

  • We encourage you to contact us first with a support request before joining Office Hours, please make sure to describe in detail your problems or questions so we can better help you!  Note: the RC team does not schedule meetings during Office Hours, however we are available to schedule meetings at any other time.

Intermediate Slurm


Grants and Citation Information