unmap command does not free up space

Hello everyone,

I need some help, we have Dell Compellent SCv3020 storages, firmware: 7.4.2.103

LUNs are to VEEAM Repository.

Example:
LUN 06: 63Tb (Total space)

Dell Compellent: 932.52 Gb (Available space)

Vcenter: 910 Gb (Available space)

Veeam: 2.1 Tb (Available space)

MS Windows: 2.1 Tb (Available space)

i´m running:
MS Windows: Garbage Collector and "sdelete -z R:"

**Windows server is up to date

Dell compellent: unmap on the volume

Questions: Can i run all commands at the same time, or do i need to run 1 at a time?

Thanks in adavanced,

Fernando Souza.