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Global Scratch File System

NOTE:  Global scratch became read-only on all systems Wednesday, September 30, 2015. It will be retired from service on Wednesday, October 14.


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.


Default global scratch quotas are 20 TB and 4,000,000 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.

Environment Variable

You can reference your personal scratch directory in global scratch as $GSCRATCH on Cray systems, or as $SCRATCH on non-Cray systems.