Global Scratch File System
The global scratch file system (or "global scratch") can be accessed by multiple NERSC systems. Its default quota is much larger than the Global Home quota, so it can be used to temporarily store large amounts of data. This file system is periodically purged.
Platforms Using Global Scratch
The global scratch file system is available on all NERSC systems except PDSF.
Default global scratch quotas are 20 TB and 2,000,000 inodes. If you need more than that, fill out the Disk Quota Change Request Form.
Yes, files in global scratch file system are subject to purging.
No, Files in global scratch file system are not backed up.
You can reference your personal scratch directory in global scratch as $GSCRATCH on Cray systems, or as $SCRATCH on non-Cray systems.