The Qouta function allow you to specify the amount of space a user is allowed to allocate on the shares to which they have access.
To remove any limitations for a user, you need to set their quota to 0.
NOTE Max quota value per user/group is 2TB. All greater values will be limited to 2TB.

You can assign a quota (limit) on the amount of space the members of a group are allowed to allocate on the shares to which they have access. Also you can make the quota relevant only to those users for whom the given group is the primary, or only for those users who do not have individual quotas set up.
To remove any limits, set the quota to 0.

Also you may find the following KB link useful for you:
http://kb.open-e.com/How-can-I-set-q...he-GUI_64.html

NOTE Max quota value per user is 2TB. All greater values will be limited to 2TB. This is the way we use Quota in DSS.