Reclaim disk space on VMware thin disk

    In a vSphere based virtualization environment we can mainly use two disk types(Thick & Thin).I hope you all know the difference between these two.

    To optimize our shared/Direct attached storage we can use thin disk. But the problem is even we delete the data from os level . It will not reclaim automatically from the storage.

    To overcome this issue we have two options.

    1. Use third party tool(if it’s a Windows we can use sdelete) to zero-out the disk blocks and using vmkfstools we can shrink the disk
    2. Storage vMotion the virtual machine or VMDK to a datastore formatted with a different block size

    In this article we are going to showcase how to use sdelete & vmkfstools to this operation

    1.This vm we have two thin disks. We will use second disk for the our test case. Capacity of the disk is 3GB

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    1. From the datastore we can see 80.47 GB free space

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