After holding up for a long time, we're implementing a new expiration policy for all files stored in
$PI_SCRATCH on Sherlock.
Starting October 1st 2017, all files in
$PI_SCRATCH that have not been modified during the last 6 months will be automatically deleted.
/scratch owners (ie. PI groups having purchased their own portion of the /scratch filesystem) will be exempted and their files will never expire nor be deleted.
Please refer to the official documentation for more details.