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Purge Policy

http://www.ncsa.uiuc.edu/UserInfo/Resources/Hardware/CommonDoc/FileSys.html#altix

The common scratch filesystem /scratch/users is available for all interactive 
work. There is a soft link scratch-global in your home directory that points 
to your scratch directory.

The purge policy is as follows:

* Starting Aug 22, 2005, files in the common scratch filesystem (/scratch/users) 
are removed on the basis of size and time since the last access:

File Size    Removed after
>= 10 GB            4 days
<  10 GB           14 days

Please do not attempt to circumvent this removal scheme (e.g., with touch). 
Such attempts may result in the loss of access to the scratch file systems.
    
* Files in the batch scratch filesystem on the SGIAltix may be purged as soon 
as the batch job that it is associated with completes. Users should use the i
saveafterjob utility for automated, guaranteed saving of files from batch jobs.

SGI Altix 3700:usr/news/Purge_Policy
Last Modified: August 12, 2005