rbd export-dif question

[Norman Uittenbogaart <normanu@xxxxxxxxx>]

Hi,

I made a backup script to backup RBD images in the pool by snapshots and exporting the

first snapshot and afterwards only the diffs.

I notices however that creating a diff from one image to the next is always a certain size.

And its much bigger then only the changes from one snapshot to the next.

I have shared the script here, https://github.com/normanu/rbd_backup

So you can see what I am doing.

But I wonder if I am doing something wrong or if there is always a overhead in backing up diffs.

Thanks,

Norman

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