vSphere: Extending a EagerZeroedThick Disk
I chanced upon this post from VMware on extending a EagerZeroedThick disk. I decide to test this out to confirm. Below is a video of my test and from the test I also discovered something different in the command, vmkfstools versus the GUI in terms of extending a disk. The followings are assured and discovered: Extend of disk in GUI do not perform will not be in EagerZeroedThick. Extend of disk via vmkfstools new disk size will not be updated on the GUI. Extend for EagerZeroedThick can only be done via vmkfstools. The extend option in vmkfstools disk size (#) MUST be the size after extension. vmkfstools -X #[ gGmMkK] Disk format ZeroedThick only works in disk creation but no in extend. vmkfstools -c #[gGmMkK] -d zeroedthick vmkfstools -X #[gGmMkK] -d zeroedthick <---- doesn't require disk format for LazyZeroed Operation considerations: If you need to extend a EagerZeroedThick disk, use vmkfstools. If possible, remove and re-add the disk back to the VM for