looks promising: virt-backup dumps and packs a 12 GB image-file within ~145 seconds to a non-compressing btrfs subvolume:
a) does a LVM-snapshot b) dd with bs=4M and through pigz to the target file The bigger LV with ~250GB is running right now. The system feels snappier than with the old kernel ... I wonder if there is more to tune as right now I am using the rather generic config which is not tuned for the specific CPU, for example (which might even have helped? ;-) ). That was good progress today ... but I might consider re-configuring the RAIDs as mentioned. As I run backups via amanda I have to provide a so called holding disk as intermediate place for dumps on their way to the tape drive. This means copying around stuff within the same hardware raid array. One big fat hw-RAID10 might be better? But losing the wrong 2 drives makes it crash again ... afaik. time for a break here. Greets, Stefan
