Each user is assigned a disk quota which limits how much they may store in their home directory. To view your quota issue the following command from a Sun.
quota -v
This will produce output similar to the following:
Filesystem usage quota limit timeleft /sulu 9091 9000 50000 1.42 weeks
Usage is your current disk usage in kilobytes, quota is the soft quota for your account. Limit is your hard quota. Timeleft will appear only if your account is over its disk quota; it refers to the amount of time you have to get your disk usage down below your allowed quota. If you fail to reduce your disk usage within the timeleft period, you will not be able to save files in your home directory until you get below your hard quota.
A user may exceed his soft quota for short periods of time. When you reach this limit, the system will give you a warning every time you try to create or write a file. You can not exceed your hard limit, ever. Once the hard limit is reached, the system will not allow you to create any files, or save any edit sessions.
Please remember that disk space is a finite and limited resource which all users share. We do not have nearly enough disk space for all users to be at their soft quotas, and we certainly don't have enough for many to be at their hard limits. Requests for increased disk quotas will only be accepted if you can demonstrate genuine need and can show that your current usage is justified.
To see how much disk space is taken up by the contents of a directory, use the du -s command. If given alone, without specifying a directory, the default is to list the disk usage (in kilobytes) for the current directory. (To get output in kilobytes on the SGI's use du -sk.) The number given is the total disk usage of all files and subdirectories. If you include a target directory, the same listing will occur, except that the listing will start with the target directory. The du command is often useful when you get warnings from the system telling you to reduce your disk usage by a certain amount.