Hello Artur...

On 23/02/17 16:27, Artur Paszkiewicz wrote:

Windows IRSM should not make any "shortcuts" in this case.

I expected and dreaded that answer equally. ;-)

[...] When it finishes you can check md/mismatch_cnt if there were any
unsynchronized blocks.

I did a resync completely on Linux and the mismatch_cnt stayed at zero,
which is nice to know but does unfortunately not change the fact that
there was a huge jump going from Linux to Windows with regards to sync
completion the last time around. :(

Knowing almost nothing about the on-disk (meta-data) structure here, I'd
guess that having an in-sync raid could also be completely due to luck
in this case.

Can you share the output of mdadm -E <raid disks> and

 > mdadm --detail-platform?

It is attached. If there is anything else you need, please let me know.
The data was pulled, btw, before I did the "test resync" above -- if
that is relevant to you.

What version of RST software are you using on Windows?

14.8.0.1042 on Win10 Pro (x86_64)

Thanks,
Matthias

-- 
Dipl.-Inf. (FH) Matthias Dahl | Software Engineer | binary-island.eu
  Hire me for contract work: Open Source, Proprietary, Web/Mobile/Desktop