Whatever you do, you do at your own risk. I can only recommend and do not claim 100% of the solution much depends on your environment and other settings. I can not guess. Addition of materials and fixing bugs is welcomed

In Vmware Esxi, there are three types of thick disks, the advantage of thick disks is performance and speed of creation, and the disadvantage is security.

  • The first type: Thick Provision Lazy Zeroed
  • The second type: Thick Provision Eager Zeroed
  • The third type: Thin Provision
  • The first type: Thick Provision Lazy Zeroed : All the space of such a disk is allocated at the time of creation, while the blocks are not cleared of data that was previously there. The first time a virtual machine accesses a new block, it is cleared. Thus, these disks are more secure, but when the block is accessed for the first time, the I / o system performance for the cleanup operation is lost.
  • The second type: Thin Provision Eager Zeroed : All the space of such a disk is allocated at the time of creation, while the blocks are cleared of data that was previously there. The advantage of such a disk is performance and security, the disadvantage is a long creation time.
  • The third type : Thin Provision: disks of this Type are created at a minimum size and grow as they are filled with data to the allocated volume. When a new block is selected, it is pre-cleared. These disks are the least productive.

Examples creating a vmdk virtual disk manually, when creating a virtual machine, select the "Do not create disk" option. Go to the ESXi server console via SSH and run the command in the folder with the virtual machine to create a disk:

command to create a Thin Provision disk:

vmkfstools –c 20G –d thick thick.vmdk

command to create a disk of type Thick Provision Lazy Zeroed:

vmkfstools –c 20G –d zeroedthick zeroedthick.vmdk

command to create a disk of type Thick Provision Eager Zeroed:

vmkfstools –c 10G –d eagerzeroedthick eagerzeroedthick.vmdk

Converting an existing vmdk disk type to ESXi

vmkfstools –j thin.vmdk

Converting a vmdk disk type thick to thin. Using the specified command, we get a thin disk from the vmdk disk of the thick type by copying it (the operation is long):

vmkfstools –i thick.vmdk thin.vmdk -d thin

After completing the procedure, replace the original thick disk with the newly created thin disk, and you can delete the original thick disk.

If you helped the article or information was useful. Gratitude should not know borders

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