The Niagara Burst Buffer is available, but in a preliminary setup, as follows:
To use burst buffer, you have to request space on it, with a proper motivation, to firstname.lastname@example.org.
Users with burst buffer access, will have a directory there that can be used. The location is $BBUFFER and is accessible like $SCRATCH from all nodes. A quota (several TBs) will be set.
Burst buffer is meant for temporary files, and will have a 48 hour purge policy setup to make sure it stays available.
Please test a burst buffer workflow using a short test job first.
Make sure to run in $BBUFFER and then copy any final solution files back to $SCRATCH at the end of the job.
Unlike /dev/shm though the files will stay between jobs, however you should still endeavour to clean up after each job.