you have to use VMware converter to reduce the VMDK size, it needs a brief downtime.
First of all you need to take in mind that the disks size and partition sizes are related, but not the same thing.
My advice, given you are already using a thin provisioned disk, is to create a new disk having the desired size, attach it to the vm, and boot using an ISO of gparted (http://gparted.org/download.php) and let it boot
That is a tool for managing partitions and from there you can copy ( and resize fs on fly) the partitions from one disk to the other.
Once you are done you just need to set the new disk as the main disk of your VM,
i have use converter but i could not reduce the linux vm size.
can you help me please
thanks you reply.
i can only reduce windows vm server. i cannot reduce the linux server.
do you have any idea about linux server reduce the space