Vmkfstools -d !!top!! 〈360p〉

A critical distinction for administrators is the behavior of the format. In a "zeroed" disk, the ESXi hypervisor uses a technique called Copy-on-Write (specifically for initialization).

vmkfstools -c 500G -d eagerzeroedthick sql_database.vmdk

It allows for granular control over the adapter type ( -a ) and block size during the same operation. Best Practices vmkfstools -d

Analysis: While the creation of this disk may take hours depending on the underlying storage speed, the database application is insulated from write penalties during production hours.

Zero latency and guaranteed space to prevent storage stalling during high transaction loads. A critical distinction for administrators is the behavior

: 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

The utility is intelligent: it clones the source disk to a new format, preserving the original until the operation completes. This makes -d safe but demands free space equal to the source disk's (not used space) on the destination datastore. Best Practices Analysis: While the creation of this

A thin disk has grown large due to temporary files, but deleting those files inside the guest OS does not shrink the VMDK file. Using vmkfstools -d thin on a thin disk (i.e., converting thin to thin) does nothing. Instead, the correct method involves vmkfstools -d zeroedthick (to force full allocation) followed by vmkfstools -d thin (to reclaim zeros), or using the --punchzero flag. While not a direct single use, -d combined with other operations enables effective space reclamation.

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