If you still have trouble with the filesystem size you can try some of these ways:
1.- mkfs command works on most Unix world, be shure you have read all the comments at the man pages this way:
man (command) is a command to access the help pages of the os. The use is:
man mkfs
You will hava a detalied description of the command. And at the bottom of the pages you will have a list of related commands, i.e. fsck (this command is used to check the integity of the filesystem), it is very possible that you might use it too.
Other way is using the administreing script that you have at your unix instalation, the name depends on your sistem, as far as I remember :
IBM AIX :--- smith from ascii console
Solaris : admintools
Linux (red hat) : linuxconf
Linux (Suse ) : Yast
You have to remember that the filesystem is commonly sized in blocks, and blocks are 512 normaly. To be shure try this command :
df -k
And you will see the sizes en Kbytes.
If you see that cleaning up files start your system as sigleuser, use the command fsck to check that your filesystem is in correct shape. See also man fsck .
If you can't work this out, and need to change the filesystems size, you may use the systems scripts or the manual commands. Just in case you may like to take a backup of your files. Use the tar command for a normal unix, or the sistem script to do so.
hope it helps