1- storage area 90%. I am deleting the virtual machine but the storage space is still 90% . Is storage space reduced if I make a storage vmotion and make a thin disk?
2- Also, What should I do when I delete a thin disk. so that the storage space is reduced
esxi 5.5 u2 - 3par and we use thick disk on vms
Once space on a thin-provisioned VMFS datastore is allocated it is not reclaimed back automatically. You can use a manual UNMAP operation, as already mentioned. Or upgrade to vSphere 6.5 and VMFS 6, where UNMAP is now automatic.