!!better!! | Vmkfstools -d

Always ensure you have a fresh backup or snapshot before running vmkfstools operations on production disks.

It can be scripted via PowerCLI or SSH for mass deployments. vmkfstools -d

), you must follow it with one of these format codes: thin : Creates a thin-provisioned virtual disk. Space is allocated and zeroed out only as needed when data is written. zeroedthick : The default thick format. Space is allocated at creation, but the blocks are only zeroed out when the virtual machine first writes to them. eagerzeroedthick : Space is allocated and all blocks are zeroed out immediately during creation. This provides the best performance but takes the longest to create. rdm: : Creates a Virtual Compatibility Mode Raw Device Mapping. rdmp: : Creates a Physical Compatibility Mode Raw Device Mapping. Veeam +3 Common Usage Examples You will typically see Always ensure you have a fresh backup or

The vmkfstools command-line utility is the foundational tool for managing VMFS (Virtual Machine File System) volumes in VMware ESXi environments. While the vSphere Client provides a graphical interface for storage management, it abstracts critical decisions regarding disk allocation. The -d flag within vmkfstools allows administrators to define the specific disk format during virtual disk creation. This paper explores the technical specifications of the available formats—Zeroed Thick, Eager Zeroed Thick, and Thin—and analyzes their impact on performance, storage efficiency, and operational workflows. Space is allocated and zeroed out only as

: The full size is allocated, and every block is wiped clean with zeros immediately. This provides the best performance and is a requirement for features like VMware Fault Tolerance and Microsoft Cluster Service (MSCS). Practical Use Cases and Syntax

While you can choose disk formats in the vSphere Client, vmkfstools -d offers advantages: