What is Block Size ?
The Block Size determines the minimum amount of disk space that any file will takes up on VMFS datastore.
The block size also determines the maximum size that any file can be, if you select a 1 MB Block Size on your data store the maximum file size limited to 256 GB.
Table illustrate different VMFS version Block Size.
VMFS-3 Block Size
VMFS-5 Block Size is less complex 😊
To Check the block size of Datastore.
From ESX Console
1. Log in to ESX using PUTTY
2. Run the command: # vmkfstools -P <path to datastore>
Where 1048576 is equivalent to 1 BM block size on a VMFS datastore.
From the vSphere Client:
1.Select an ESX host that contains the datastore
2.Click the Configuration tab.
3.Click Storage.
4.Select the datastore.
5.The block size is mentioned below Datastore details windows
Note: There is no way to change the block size of a VMFS datastore once it is created. The data store must be deleted, recreated and reformatted with the required Block Size.
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