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First Snapshot size of the VM.

Posted on 2016-11-23
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Last Modified: 2016-11-24
First Snapshot size of the VM.

If I take a snapshot of the VM the first time. Is the size of the snapshot going to be roughly the same size as the VM or it is going to be just an empty file.

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Question by:jskfan
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 1000 total points
ID: 41899446
Almost ZERO, and it will grow, at a rate of approx 1GB per hour, based on changes in the VM.

Initial Snapshot size - (244kb)
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by:Qlemo
Qlemo earned 1000 total points
ID: 41899471
The question is indeed whether the snapshot file is ever growing, or only reflecting changed blocks - if the same block is rewritten several times in the VM, does it also create new blocks in the snapshot? I guess that is something which should be made clear here, too - for reference ;-).
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by:jskfan
ID: 41900344
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by:jskfan
ID: 41900345
Oops,

I meant to reward Qlemo too
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by:Qlemo
ID: 41900461
To answer my question posted above: Snapshot files cannot extend to a size larger than the original virtual disk files. The snapshot file contains all changed blocks, and if a block has been changed 100 times, it still is only a single block - the snapshot reflects only that last change for this block.
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by:jskfan
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