@f-bosch  Hi Frederik, about the second issue you mentioned ("The more
data getting on the disk, the higher the spikes are...requests that
involve write operations tend to have these characteristics") in #54,
it looks there is a storage I/O performance downgrade somehow.

Do you think if it's related to the backup issue?
If not, do you think if we needs special I/O patters to trigger the perf 
downgrade?

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https://bugs.launchpad.net/bugs/1470250

Title:
  [Hyper-V] Ubuntu 14.04.2 LTS Generation 2 SCSI Errors on VSS Based
  Backups

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