Storage Quota / Limits
Some limits are imposed on your disk usage on research systems. A quota is implemented on each filesystem. Each filesystem (home directory, scratch directory, etc.) may have a different limit. If you exceed the quota, you will not be able to save new files or new data to the filesystem until you delete or move data to long-term storage.
Link to section 'Checking Quota' of 'Storage Quota / Limits' Checking Quota
To check the current quotas of your home and scratch directories check the My Quota page or use the
$ myquota Type Filesystem Size Limit Use Files Limit Use ============================================================================== home myusername 5.0GB 25.0GB 20% - - - scratch hammer 220.7GB 100.0TB 0.22% 8k 2,000k 0.43%
The columns are as follows:
- Type: indicates home or scratch directory.
- Filesystem: name of storage option.
- Size: sum of file sizes in bytes.
- Limit: allowed maximum on sum of file sizes in bytes.
- Use: percentage of file-size limit currently in use.
- Files: number of files and directories (not the size).
- Limit: allowed maximum on number of files and directories. It is possible, though unlikely, to reach this limit and not the file-size limit if you create a large number of very small files.
- Use: percentage of file-number limit currently in use.
If you find that you reached your quota in either your home directory or your scratch file directory, obtain estimates of your disk usage. Find the top-level directories which have a high disk usage, then study the subdirectories to discover where the heaviest usage lies.
To see in a human-readable format an estimate of the disk usage of your top-level directories in your home directory:
$ du -h --max-depth=1 $HOME >myfile 32K /home/myusername/mysubdirectory_1 529M /home/myusername/mysubdirectory_2 608K /home/myusername/mysubdirectory_3
The second directory is the largest of the three, so apply command du to it.
To see in a human-readable format an estimate of the disk usage of your top-level directories in your scratch file directory:
$ du -h --max-depth=1 $RCAC_SCRATCH >myfile K /scratch/hammer/m/myusername
This strategy can be very helpful in figuring out the location of your largest usage. Move unneeded files and directories to long-term storage to free space in your home and scratch directories.
Link to section 'Increasing Quota' of 'Storage Quota / Limits' Increasing Quota
Link to section 'Home Directory' of 'Storage Quota / Limits' Home Directory
If you find you need additional disk space in your home directory, please first consider archiving and compressing old files and moving them to long-term storage on the Fortress HPSS Archive. Unfortunately, it is not possible to increase your home directory quota beyond it's current level.
If you find you need additional disk space in your scratch space, please first consider archiving and compressing old files and moving them to long-term storage on the Fortress HPSS Archive. If you are unable to do so, you may ask for a quota increase at firstname.lastname@example.org.