The idea behind quota is that users are forced to stay under their disk consumption limit, taking away their ability to consume unlimited disk space on a system. Quota is handled on a per user, per file system basis. If there is more than one file system which a user is expected to create files, then quota must be set for each file system separately.
1: To install quota: # yast2 -i quota
2: Edit /etc/fstab and add usrquota,grpquota to the mountpoints of the filesystem to which you want to enable quota (example /disk below)
# vi /etc/fstab
/dev/sda6 /disk ext3 defaults,noatime,usrquota,grpquota 0 0
3) Now go (cd) to the mount point (/disk) and create the quota files
# touch /aquota.user /aquota.group
# chmod 600 /aquota.*
4) Remount the partition: # mount -o remount /disk
5) Run the following command to initialize the quota on the /disk filesystem
# quotacheck -avugmThe -a switch tells quotacheck to perform the check on all filesystems. The -u and -g switches tell it to check for user and group quotas. Using the -m switch means the filesystem will not be remounted as read-only.
# quotaon -avug
The first time you run the quotacheck command, it will throw up several warnings because the filesystem had not been checked before.
quotacheck: Scanning /dev/sda6 [/disk] done6) Your filesystems are now set up to use disk quotas. To turn them on, use the quotaon command:
quotacheck: Cannot stat old user quota file: No such file or directory
quotacheck: Cannot stat old group quota file: No such file or directory
quotacheck: Cannot stat old user quota file: No such file or directory
quotacheck: Cannot stat old group quota file: No such file or directory
quotacheck: Checked 20 directories and 661 files
quotacheck: Old file not found.
quotacheck: Old file not found.
# quotaon -augvOnce quotas are enabled, you can use the edquota command to limit the disk space available to users. The edquota -u username command will open up a text editor wherein you can specify the soft and hard inodes and blocks limits for a particular user. The edquota -g command can similarly be used to edit group quotas.
/dev/sda6 [/disk]: group quotas turned on
/dev/sda6 [/disk]: user quotas turned on
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source:http://linuxpoison.blogspot.com/2009/04/135781757116864.html