Actually, both enabling block alignment or disabling unbuffered access should help (either of those). In v11 we've forced unbuffered access by default, which doesn't work well with the disabled block alignment setting on the repository. The issue doesn't show up on the new repositories created in v11 as block alignment is enabled by default for those, while the upgrade procedure doesn't change the alignment setting for existing repos.
So, in short:
Performance degradation:
- block alignment = disabled
- unbuffered access = enabled
Normal performance:
- block alignment = enabled
- unbuffered access = enabled
or
- block alignment = disabled (recommended for StoreOnce and other dedupe devices)
- unbuffered access = disabled
This is going to be addressed in one of the next updates for v11. #vbr #veeam #v11 #issue #alignment