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Problem

Old files Files in /scratch were deleted.

Solution

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Explanation

There is a "purge policy" (explained here) which means that files in /scratch not used accessed within the last 21 days may will be deleted.

Note that:

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This policy is presented, within the the Message of the Day (MotD) banner, displayed at login, as follows

Please remember that NO filesystems are backed up, and any files in /scratch
that have not been accessed for 21 days or more will be permanently deleted. 
You are responsible for ensuring you have a copy of any critical data.

Notes

• 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.
• Some files in a directory may get deleted while others remain. It depends on what was accessed in the last 21 days.
• When copying/rsyncing/untarring files, be sure not to retain original timestamps, otherwise the files might be immediately eligible for purging.
• As Pawsey recommends keeping copies of "long-lived" data within its Acacia object storage system,
  please familiarise yourself with some of the known issues when using the object storage,
  as documented in the Acacia - Troubleshooting page.

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