VMware

Thin Provisioned HDD Eating Up Tons of Space on My NAS

I’m a rookie with esxi and I created a thin provisioned disk on one of my VM’s. with 4TB.

It’s taking up the full 4TB of disk space on my QNAP NAS, yet it’s never had more than about 2.8TB.

**Why would that be?**

Below is how it’s configured in ESXI and also a picture of the size being eaten up on my NAS.

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[Why is all 4TB being used if it’s thin provisioned?](https://preview.redd.it/l4gisd3loxp51.jpg?width=1804&format=pjpg&auto=webp&s=7a69effb36ba7ca86e4cf13925676fc8e4b7dd41)


View Reddit by jimerb1View Source

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4 Comments

  1. without knowing anything about the VM

    this provisioned allocates space as it needed it, you create 300gb of data to increases the disk by that much

    you delete the 300gb of data it does not decrease the disk

    you create 300gb more of data in increases that disk by that much again

    where there a bunch of large disk changes to the VM?

    will also depend where your data is stored

  2. The VM in the screenshot has a different name. Are you sure you’re looking in the right place?

    Also, I don’t remember how sparse files would present themselves over Samba – if you create a sparse file on Linux and look at it from the command line then it shows as the max size, not the current size. So this may be normal.

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