Scratch is Scratch!
The /scratch file system on Peregrine is named scratch because it is intended for data that is only needed temporarily, while your jobs are running. It’s like scratch paper! It is not backed up and your files may be deleted (purged) if the /scratch file system gets too full. Which files are deleted is based on last access time — we may delete any files that haven’t been used in 28 days. While auto-purging is NOT being done now, depending on how fast new data is created in scratch, we may need to delete files with little warning to ensure that the file system remains usable. Delete files you don’t need and move the files you’re not actively using to /mss so that you don’t lose important data!