/scratch filesystem¶

Usage¶

/scratch is a shared high performance storage that system provides access to large amounts of disk for short periods of time. It meant to be used as the work space for jobs.

Everytime a new user account is created the system will also create a subdirectory under /scratch filesystem of the form /scratch/username.

Remember that /scratch filesystems are not meant to be used as a permanent storage solution. When the occupancy goes above 80% the BeeGFS filesystem shows a performance degradation that affects all users. The same applies with large numbers of small files, since the BeeGFS filesystem is not behaving ideally when dealing with high volumes of small files. Therefore, avoid having too many files (>1000) within the same directory.

Quotas¶

• Disk usage: 2 TB
• Max. files: 3 Million

Check your usage on /scratch:¶

Since the usage of the /scratch filesystem is limited for each user to 2TB. It may be useful to check your occupation.

Keeping in mind that Hyperion cluster features three BeeGFS filesystems mounted (/scratch, /home and /data), three aliases have been created in order to check the quotas corresponding to each filesystem, being these getquota-home, getquota-scratch and getquota-data:

$ getquota-scratch

Checking quota in /scratch filesystem for user username

Quota information for storage pool Default (ID: 1):

      user/group     ||           size          ||    chunk files
     name     |  id  ||    used    |    hard    ||  used   |  hard
--------------|------||------------|------------||---------|---------
    username  |  xxxx||   43.81 GiB|    2 TiB||   262281|  3000000