Storage Overview

Storage

There are two shared file systems on ARIS, HOME and WORKDIR . All login and compute nodes may access same data on shared file systems.

File system overview

File system	Type	Env. Variable	Size	Lifetime	Backup	Quota	Description
/users	GPFS	$HOME	250 TB	Project duration	NO	*	source files, input data
/work	GPFS	$WORKDIR	500 TB	Project duration	NO	*	short term, fast storage

$HOME

Users are NOT supposed to run jobs from this filesystem because of the low performance.

In fact the emphasis on the /users file system is reliability over performance.

Store your source code and build your executables here.

The $HOME environment variable points to the personal folder /users/[username]

$WORKDIR

The emphasis for the /work file system is on performance rather than reliability, as a fast workspace for temporary storage.

Store large files here.

Change to this directory in your batch scripts and run jobs in this file system.

The $WORKDIR environment variable points to the personal folder /work/[username]

Quota

Users are restricted by file system usage quotas. Limits are set accordingly to the project request for storage resources.

*In any case, if the granted storage size should prove as insufficient please contact support, the quota may be lifted upon request.

Quota commands

User quotas on the file systems can be checked with mmlsquota command

$ mmlsquota --block-size 1G

                         Block Limits                                    |     File Limits
Filesystem type             GB      quota      limit   in_doubt    grace |    files   quota    limit in_doubt    grace  Remarks
gpfs0      USR              14       1000       1200          0     none |     1008       0        0        0     none 

                         Block Limits                                    |     File Limits
Filesystem type             GB      quota      limit   in_doubt    grace |    files   quota    limit in_doubt    grace  Remarks
users      USR              27       1000       1200          0     none |   110914       0        0        0     none 

Check disk usage with du command

Ex: $HOME directory

$ du -chs $HOME

File system Policy

IMPORTANT INFORMATION - PLEASE READ:

There is NO BACKUP done of any user data located on both the $HOME and $WORKDIR file systems.

The only protection of your data is the redundant disk subsystem. This RAID system is able to handle a failure of one component. There is NO way to recover inadvertently removed data.

Users have to backup critical data on their local site!