for my vm four drives are there I want to increase one drive capacity but there is no space on the data store
Solution is you have to change one of the drive to another datastore and increase the space.
First findout in which datastore space is avaialble.
Select VM and migrate - datastore migration - Advanced - click the drive on which you want increase the space - browse - select datastore where the space is available - Finish
After migration - increase the space.