VNX 5300 full

Hi there, I have a big trouble at my vnx.

From my vmware, these datastore show 50% free space, but on vnx it's almost full and I have no space to increase the pool.

How do I release the space on my vnx?

My hardware is: VNX 5300 and vmware 5.5

There is an alert:

Severity : Critical

System : stg-DataCenter

Domain : Local

Created : Sep 18, 2018 6:01:53 PM

Message : Alert VP: Storage usage of pool Pool Producao has crossed threshold value 85.0% and has reached to 91.2%.

Full Description : The virtual thin pool's storage usage has reached the maximum threshold. To continue using the pool, you must add additional storage to the pool.

Recommended Action : Using Unisphere:

1) Log in as nasadmin (or as a user with NAS administrative privileges).

2) Navigate to the Storage > Pools list page.

3) Go to the properties page of the thin pool identified in the log message or alert.

4) Look for the Physical Storage Usage of this virtual thin pool.

5) Extend the pool if there are existing Celerra storage resources available that can be used. If no storage is available to extend the pool then you will need to add the appropriate type of physical disks to the system so that it can be extended.

For more information or assistance, search the Knowledgebase on Powerlink as follows:

  a. Log in to http://support.emc.com and go to Support > Knowledgebase Search > Support Solutions Search.

  b. Use the message ID or text from the error message's brief description to search.

Event Code : 0x12608700e0