Hot-extending a virtual disk is the act of increasing the capacity of a virtual disk while it’s operating and the guest OS is running. Today is a really simple operation to perform, on both ESXi and Hyper-V, but still very useful.
We are going to see how to hot-extend a virtual disk connected to a running VMware ESXi virtual machine with the vSphere Web Client.
Log in your account and go to the Inventory:
Choose an operating virtual machine from the Inventory, right-click and select Edit Settings:
It’s time to increase the capacity. Select the desired capacity and click Ok, the client will perform the operation:
Now you can allocate the added capacity from the guest OS: