i don't see the point, you do want to oversubscribe because not everyone will use capacity that's been allocated to them. I would concentrate on file system capacity management, array capacity management.
We do have unified VNX 5300 array. We are facing issue with tree quotas on our vnx box. We have created department wise file systems and several tree quotas are created on those file system. issue here is vnx is allowing to create tree quotas whose size in total is greater than actual file system size. just for clarification eg. file systems size is 4gb, tree quotas can be created greater than 4 gb , like 3 tree quotas of size 2GB each. this is resulting in scenario like file system getting full >users still see they have space as per tree quota settings > user cannot write new data as actual file system is full. How can this be prevented. Do we have some configurations missing ?
Issue with Tress quotas on VNX5300