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guide:filesystems

File Systems

The primary file systems available to users are:

Name Mount point File System Size Quota Backup Access
“Home” /home NFS 80 TB 15 GB Yes Yes
“Lustre” /mnt/lustre Lustre 4 PB none NO Yes
“Apps” /apps NFS 20 TB none Yes On request
“Data” /lustre/data Lustre 1 PB none NO On request only

In the above table Name refers to the colloquial name of the file system, i.e., what it is referred to in ordinary speech or writing.

Home

The home file system contains all users' home directories as is usual for a Linux system. This is where your standard and primary files reside, most especially your ssh keys file, your login scripts and other configuration files.

Quota

Your home directory is subject to a strict quota. Once you exceed that quota you will not be able to write any more to any file within that directory. This has implications for files that log various things, e.g. your command line history, and installed applications.

For this reason, large application codes should be installed in your Lustre directory, or you should use a pre-installed application from the Apps file system.

To request that an application be installed in Apps please open a Helpdesk ticket.

Lustre

The Lustre file system is a high performance parallel file system which is to be used for all running jobs on the Lengau cluster.

This is a work space, or “scratch” file system and is not intended for long term storage. Any files you store on Lustre must be required for your jobs. Files that have not been accessed for more than 60 days will be considered stale and may be deleted if the Lustre file systems fills up (exceeds 80% usage).

Note that Lustre has a complex structure and is best suited for large files and parallel access. See the separate Lustre guide for more information and important tips on use.

Job Scripts

The working directory for all your job scripts must be on Lustre. Each user is allocated a directory on the Lustre file system under

/mnt/lustre/users/username

where username is replaced by your user name.

Large codes, data sets, and output data must be stored under your Lustre directory. This is why we often refer to Lustre as the “work” file system—it's where all your work resides.

Smaller applications, scripts, libraries, etc. can be stored in your home directory, of course.

Lustre is NOT Backed Up

We do not keep a back up of Lustre. Any loss of files and data is entirely unrecoverable. It is thus essential that you take data management seriously and ensure that you have adequate off site storage to maintain your own copies of any important files or data on Lustre.

Lustre is designed for performance and capacity.

To upload or download data to/from Lustre use the scp login node for small files (~10GB) or the Globus system for large files (>100GB). See the Connection Guide for more details and important tips.

Apps

The Apps file system contains application codes, libraries, development tools, compilers, etc., installed by the CHPC for our users.

This system is accessed through the GNU modules tool module. Examples are provided in the Quick Start Guide.

Data

By special arrangement research groups may store files and data that are shared by members of that group for longer term (up to 365 days).

/var/www/wiki/data/pages/guide/filesystems.txt · Last modified: 2020/05/18 16:10 by kevin