Flux Storage Options

By February 24, 2016

Several levels of data storage are provided for Flux, varying by capacity, I/O rate, and longevity of storage. Nothing is backed up, except AFS. Please contact hpc-support@umich.edu with any questions.

Storage type / location Description Best Used For Access and Policy Details
/tmp
Local directory unique to each node. Not shared. High-speed read and writes for small files (less than 10GB)
/home
Shared across the entire cluster. Only for use with currently running jobs. Quota of 80GB per user. Currently running jobs.
/scratch
Lustre-based parallel file system shared across all Flux nodes. Large reads and writes of very large data files. Checkpoint/restart files and large data sets that are frequently read from or written to are common examples. Also, code that uses MPI. ARC-TS /scratch page
AFS
AFS is a filesystem maintained and backed up by ITS. It is the only storage option available for Flux that is regularly backed up, and is therefore the most secure choice. It is only available on Flux login nodes and can provide up to 10GB of backed-up storage. Storing important files. NOT available for running jobs on compute nodes. ARC-TS AFS page
Turbo
Turbo Research Storage is a high-speed storage service providing NFSv3 and NFSv4 access. It is available only for research data. Data stored in Turbo can be easily shared with collaborators when used in combination with the Globus file transfer service. Storing research data. ARC-TS Turbo page
Long-term storage
Users who need long-term storage can purchase it from ITS MiStorage. Once established, it can be mounted on the Flux login and compute nodes. Long-term storage. ITS MiStorage page