Pegasus FAQ

  1. Q: What’s /scratch directory in Pegasus?A: Users in Pegasus have been allocated a special directory, called “/scratch”, to save their data (input and/or
    output data for running jobs) for any TEMPORARY purpose. Since the storage under /scratch normally achieves
    better I/O performance via parallel file systems, jobs with heavy I/O thus would benefit more by fully utilizing this directory.
  2. Q: What’s the difference between /home and /scratch directories?A: HOME directory is intended primarily for basic account information, source codes, and binaries etc. The space
    under /HOME is limited to 250GB for each user, and won’t be purged. SCRATCH is intended for temporary storage of
    input/output data of running jobs, and any data older than 3 weeks under SCRATCH is subject to purge without backup.
  3. Q: Can I save my data in /scratch for another two weeks since I need the data to catch an important deadline?A: No. Any data older than 3 weeks are subject to purge without backup.
  4. Q: How can I use /scratch directory?A: Users are encouraged to create his/her own directory as /scratch/[User_Name] and put all job-related data under that
    directory, which will avoid any confusion with other users’ files.
  5. Q: Can I request to extend wall-time limit of my running jobs?A: No. Our current job scheduler configuration does not allow modify running job properties, including wall time limit.
    You will have to resubmit your job with more wall-time requested.