thin disk and space issue

[reziel84]

hi all

at first thanks for your support, this forum is amazing.

i have DSM 6.2.2 on ESXI 6.7 with 1 disk fors boot 50mb and one of 1tb for data, both disks are in thin.

i just put 700gb of data on 1tb disk and DSM alert me of disk space it's full.

when i delete about 600gb of data the size of disk not decrese but tell me 700gb used, but the really size of all files is about 200gb and so, why?