Disk Space Usage Policy

Date of last revision: 11/10/1999

Diskspace topics:

Disk Usage Limits

Disk "quotas" have been implemented on the Design Center computer systems. A quota is a limit on the amount of disk space you can use. Once you have reached your quota, you will not be able to write anything to the disk. All of your directories (Unix home directory, Windows NT home directory and profile, webpages) share a combined limit.

Actually, you can exceed you quota for up to two days before your write privileges are turned off. However, there is an absolute maximum of 125% of your quota which you may never exceed. This extra space is intended to prevent the loss of your work if you accidentally go over your quota.

Current Disk Quota Defaults

Note: Technically, these numbers are 1000-kilobyte blocks, not megabytes (which are 1024kb), but it isn't much of a difference and it's easier to manage this way.

Checking Your Disk Usage

You can enter your Unix username and password here to display your current quota information.



On the Unix system, you can use the command quota -v to check your quota. The quota command will list your usage ( in K bytes ). Using the quota command without the -v flag will only report if you are over your quota, and by how much ( in K bytes ).

There is no way of directly checking your quota in NT.

To check the disk space of your Unix files, you can use the dus command. This command was developed in the Design Center, and is known to have problems if you have filenames with spaces in them in your directory. The dus command normally lists the size of all files in the current directory, or you can specify a list of files to check. If the first option to dus is -sort, the list of files will be sorted in order of increasing size.

To check the disk space of your Windows NT files, either find them under /users/nt and use dus or you can right-click on a single file or directory and select Properties to see how much disk space it uses.

New! The diskquota command will report both your disk quota and the disk usage in your individual directories. Note that the numbers reported for your quota and your total disk space may not match exactly due to rounding.

Temporary Disk Space

The /tmp directory is local to each Unix machine and generally has very little space available. These directories are purged daily. The NT equivalent is C:\TEMP.

There is also a 4 GB scratch disk available for temporary storage. It is automatically purged once a week on Monday mornings, although we reserve the right to purge it at any time if we need to reclaim some of that disk space. Scratch storage is not backed up. On Unix, the scratch drive is /scratch and it is F:\ on NT.

The directory /scratch/tmp is intended to be used as a version of /tmp that is visible to all machines and larger than /tmp in most cases. It is purged daily.

Quota Increases

Quota increases are only given if there is a demonstratable need for additional diskspace and there is a legitimate academic reason for its use. All quota increases must be processed through the System Administrator. To verify your needs, the System Administrator will go through the files in your account.

If you would like to request an increased quota, send mail to root@scudc.scu.edu. Be sure to include:

If you do not include this information, your request will not be honored.

Note: Requests for quota increases usually will not be granted unless you are already using at least 80% of your current quota.

Other Topics of Interest