1) Yes, but I might need some help with that. Which list/maintainer should I 
submit it to?

2) On our test machine, with both the hyper-v host as well as the guest under 
heavy i/o load, it was a few hundred ms but with high variance and spiking 
(quite often) in to the 2-4s range, with some extreme values being 10s and 
I assume that this varies a lot with regards to the test hardware, especially 
With light load (but not idle) this was well in the <100ms range but with 
occasional spikes.
Another thing I noticed was that the freeze operation often took a lot longer 
(but not always) when triggered directly by the vss daemon through a host 
backup and not just from a standalone test program which just called 
FREEZE/THAW in a loop.

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

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