[solved] snapshot@vm - question - RAM / no RAM


Active Member
May 20, 2018
Ver 6.3-3

I am curious about snapshots of my ubuntu vm: When I create snapshots with RAM enabled, there is automatically an entry for a ZFS dataset of 21.1 GB added - regardless of filesystem changess.

hmir/data/vm                              194G   953G       96K  /hmir/data/vm
hmir/data/vm/vm-200-disk-0                131G  1004G     45.2G  -
hmir/data/vm/vm-200-state-docker         21.1G   972G     2.12G  -
hmir/data/vm/vm-200-state-fresh_noadmin  21.1G   968G     5.97G  -
hmir/data/vm/vm-200-state-portainer      21.1G   972G     2.32G  -

However, if I add 20GB of data, then take a new snapshot with no RAM enabled, this list doesn't change at all and I cannot see where the extra data has been added in the new snapshot.

Simple question: Where can I see the snapshot data when no RAM is selected? (aside from the PVE gui)

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Just use zfs list. "REFER" is the size of the VMs/LCXs data only and "USED" is the size incl. all snapshots.
If you enable RAM it will dump the content of your RAM and safe it as a new block device so you can rollback to a running state. If you snapshot without dumping the RAM and you will do a rollback, it will be as if the LXC/VM encountered a power outage and crashed.
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