Monitoring, Management & Location Tracking

Difference between Thick and Thin provisioning in VM



What are the difference between Thick and Thin disk provisioning in Virtual Machine



In Thick provisioning we have two methods. One is Thick provision Lazy Zeroed and Thick provision Eager Zeroed


Thick Provision Lazy Zeroed

Creates  a virtual disk in a default thick format. Space required for the  virtual disk is allocated when the virtual disk  is created. Data  remaining on the physical device is not erased during creation, but is  zeroed out on demand at a later time on first write from the virtual  machine.
Using  the default flat virtual disk format does not zero out or eliminate the  possibility of recovering deleted files or restoring old data that  might be present on this allocated space. You cannot convert a flat disk  to a thin disk.

Thick Provision Eager Zeroed

A  type of thick virtual disk that supports clustering features such as  Fault Tolerance. Space required for the virtual disk is allocated at  creation time. In contrast to the flat format, the data remaining on the  physical device is zeroed out when the virtual disk  is created. It  might take much longer to create disks in this format than to create  other types of disks.

Thin Provision

We can use  this format to save storage space. For the thin disk, you provision as  much datastore space as the disk would require based on the value that  you enter for the disk size. However, the thin disk starts small and at  first, uses only as much datastore space as the disk  needs for its  initial operations.


Note: We recommend Thick provision for Airwave and Clearpass Applainces 

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Last update:
‎04-28-2020 05:45 AM
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