On 04/30/2018 03:52 AM, Steven Haigh wrote:
What would be the expected outcome when the dd reads the TRIM'ed space on the snapshots of these Windows VMs? The lack of compressability of the free space now would suggest that maybe the raw read on a TRIMed sector would return random data.
This is often undefined (moreover, starting with kernel commit 48920ff2a5a940cd07d12cc79e4a2c75f1185aee it's guaranteed to be undefined). You can't expect the discarded area to be zeroed unless you overwrite it with zeroes explicitly.
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