[pve-devel] Proxmox VE 4.0 beta2 released!
dietmar at proxmox.com
Thu Sep 10 17:05:50 CEST 2015
> qcow2, as a copy on write format, allows snapshots regardless of the
> storage under it.
Yes, and this functionality is implemented in qemu. But you cannot make
snapshots when you use qemu-ndb (not supported by qemu-nbd).
> Also qcow2 is thin provisioned, that means it grows as you add data
> (doesn't shrinks automatically) whereas with raw the whole image size
> gets allocated on creation.
you can also create sparse 'raw' files.
> qcow2 has some overhead in comparison to raw.
and really much overhead if you use qemu-nbd.
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