[pve-devel] some news for snapshots

Dietmar Maurer dietmar at proxmox.com
Mon Aug 27 10:07:02 CEST 2012

> for qcow2 internal snapshot:
> -----------------------------
> We can't use qemu-img -c, to create snasphot, when vm is online. (confirmed
> by Stefan Hajnoczi from qemu mailing) It cause corruptions, and bad things.
> (I have tested it and had crashed my qcow2 file after some online snapshot
> and offline rollback) So no online internal snapshot for now. (I have tell the
> question if online internal snapshot is on the roadmap, don't have response
> yet from qemu mailing)

AFAIK, you can already create a snapshot of COW2 files using 'savevm' command.
So I think the basic code must be there? It is just not implemented inside the
'blockdev-snapshot-sync' command.

- Dietmar

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