VM disk configuration modes and their differences

There are three VM disk configuration modes:
Common: The system allocates disk space based on disk capacity. During disk creation, any data remaining on the physical device will be reset to 0. This mode results in better disk performance than the others, but disks take longer to create.

Thin provisioning: In this mode, the system initially only allocates part of a disk's configured capacity. The rest is allocated as needed based on its storage usage, until all of the configured capacity has been allocated.

Thick provisioning lazy zeroed: The system allocates disk space based on disk capacity. Unlike common mode, however, any data remaining on the physical device is only zeroed out on the first data write from the VM. This mode creates disks faster than common mode, and its I/O performance falls between that of the common and thin provisioning modes.

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