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Is it safe to use guestfish's zerofree option on ext4 which is inside an LVM volume? If not, what is the best approach - rebooting (inside the VM) into recovery mode and using the regular zerofree utility? I am having trouble finding any references online to using these two tools with LVMs.

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up vote 1 down vote accepted

It should "just work".

There is more detail about the problem here:

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