Why you use quotas
You can use quotas to limit resource usage in FlexVol volumes, to provide notification when resource usage reaches specific levels, or to track resource usage.
You specify a quota for the following reasons:
To limit the amount of disk space or the number of files that can be used by a user or group, or that can be contained by a qtree
To track the amount of disk space or the number of files used by a user, group, or qtree, without imposing a limit
To warn users when their disk usage or file usage is high