Old files in /scratch were deleted.
The Scratch Purge Policy is that files in /scratch not used within the last 30 days may be deleted.
- Some files in a directory may get deleted while others remain. It depends on what was accessed in the last 30 days.
- When copying/rsyncing/untarring files, be sure not to retain original timestamps. Otherwise the files might be immediately eligible for purging.
- There are multiple timestamps for files - last access, last modification, and creation. Purging is based on access time. "ls -l" by default shows modification time. You should use the "-u" flag to see last access time. "ls -ltu" is recommended.