[ovirt-devel] Re: Backup: how to download only used extents from imageio backend
On Thu, Jul 2, 2020 at 5:36 PM Michael Ablassmeier <abi(a)grinser.de> wrote:
hi again!
On Thu, Jul 02, 2020 at 03:28:45PM +0300, Nir Soffer wrote:
> If you want to test this code, you can use git:
> $ git clone https://gerrit.ovirt.org/ovirt-imageio
> $ git fetch https://gerrit.ovirt.org/ovirt-imageio
> refs/changes/69/110069/1 && git checkout FETCH_HEAD
i just adopted my POC for using the new functions and it worked
flawlessly, backing a virtual machine full/inc and restoring it. Im
going have more thoughts the coming days, but for now that seems a good
and usuable interface for us!
Just as a side note if anyone whos trying with full/inc chains: the
backup stream of the full chain includes the stop frame, so you cant
just do "upload < full inc", as it will always exit the loop if the
first stop marker is hit, not attempting to upload the changes from the
inc file ;)
Well this is just an example how to use the API. Real code will probably
have some "start" frame with metadata, and will continue after the stop frame
if needed.
But it will probably be more useful if the backup software can
generate a restore
stream on the fly, instead of playing back the recorded data, so you don't write
the same area multiple times.
thanks for all your input!
bye,
- michael