Resource Limits

Disk Limits and Usage

1. Disk quotas in effect for all users
• The default quota for new users is 10 Gbyte.
• All requests for additional disk resource must be initiated by filling out the Request for Additional Disk Space Form. Instructions for completing and sending the form are on the form.
2. Mass storage

   MHPCC provides virtually unlimited data storage to its Mana users via the data archive system. The hostname of the archival system for each platform is available in the ARCHIVE_HOST environment variable. An individual user's directory on this system is available through the ARCHIVE_HOME environment variable. Please consult the online documentation for details on how to use the archive system.

3. Temporary disk space

   There are several file systems available for temporary disk space:

   MANA

   Name	Description	Size	Purge Policy
   /scratch	Local and unique to each node.	30 Gbytes	After each run
   See WORKDIR environment variable	Global shared scratch	200 Tbytes	Files older than 14 days are purged

4. How you can help

   Disk usage will be periodically reviewed by MHPCC and if it is determined that any user is consuming an excessive amount of disk space, that user will be notified. For the most part, however, MHPCC encourages all of its users to practice "good neighbor" computing, keeping in mind that the system is shared by hundreds of other users and that disk resources are limited. Some practices which help all users include:

   • Always remove your files from public, shared disk space as soon as you no longer need them. This includes files in any of the scratch file systems.
   • Periodically "clean up" your home directory to remove old and unnecessary files.
   • Check with the MHPCC Help Desk () before installing software in your home directory which might be of general use to other users. In this way, MHPCC can install one version in a single location and prevent the waste of disk space that occurs when multiple versions are installed in various user home directories.