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What is Thin provisioning and sparse allocation?

Hi Experts,

I'm reading some virtualization articles, What is Thin provisioning and sparse allocation? Can someone explain to me in a simple detail?
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julian_brunt
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Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
sparse allocation or pre-allocated - the storage is pre-allocated to the virtual machine or storage device.

For Example, if you create a 40GB virtual disk, 40GB is allocated all at the same time, and occupies 40GB on the datastore (it does not matter that the OS is using inside the disk).

Thin Provisioning - appearance of more physical resource than is actually available.

So in the above example, if you create a 40GB virtual disk - but thin provisioned, it appears to the OS as 40GB, but it only takes up on the datastore, what is used buy the OS, and virtual disk grows dynamically to 40GB, based on consumed resources.
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So it's basically the same...

Wow! that was fast, thank you Guys for clearing this out

I'm beginning to like this site =)