I am running ESXi and now after years of operation one of the virtual servers require more space. However, before I can increase the space I have to increase the block size because initially I used the default block size of 1kb (maximum 256 gbyte) which at the time was ample.
The question is: can I increase/change the block size after virtual machines are installed or do I require a clean and empty datastore to set the block size?
If changing the block size on the fly doesn't affect the VM then I can easily proceed with it but I am thinking since it changes everything at the block level then it will alter the whole datastore meaning that it will affect all VMs installed in that datastore. So in such case then I will have to either reinstall the VMs or do a backup then restore after the block size is changed before I can use a partition tool to increase the size of the VM.