revise your Boot device, use command du or df
please post result of "df -ha"
/dev/mapper/sda-crypt 7.3T 7.3T 64K 100% /srv/dev-disk-by-label-erlendstorageI
is full
is your destination?
move or delete some files on /srv/dev-disk-by-label-erlendstorageI and retest if copy works and no error messages appear, this test show you if /srv/dev-disk-by-label-erlendstorageI is the problem.
What policy do you have in UFS configuration?
If you have a path preserving policy, you must manually create the folder on the second disk, or change the UFS policy to one that does not preserve path.
If you're using MergerFS (it's called UnionFS on OMV) changing the policy to Most Free Space would solve the problem.
It has been shown that it is better to be more concise than to give so many explanations 
It has been shown that it is better to be more concise than to give so many explanations
I sincerely appreciate your willingness to make an effort. 
Thanks.
A pleasure, thanks to you for your help
It has been shown that it is better to be more concise than to give so many explanations
Well, one adds to the other.
That is the great thing of a forum. Different persons can give their input. Some users just want a fix and others want to understand and spend the effort to learn. And you never know what a particular user wants at this point in time.
If you're using MergerFS (it's called UnionFS on OMV) changing the policy to Most Free Space would solve the problem
If memory serves me correctly that is not the default setting, I wonder if it's possible to change that within the plugin as this seems to come up as a root cause of data distribution.
If memory serves me correctly that is not the default setting
The default setting is "epmfs (existing path, most free space)".
When the first disk is full, users do not know what to do to fill the second. You have to change the policy to continue filling. I have seen multiple threads with the same problem.
The default setting is "epmfs (existing path, most free space)".
I'm sorry the point I was trying to suggest was perhaps it would be prudent for the plugin on it's initial install be changed to mfs rather than epmfs. As I used this with snapraid previously I know how it functions and how it's set up.
The problems most users have is not changing the default setting and wonder why only one of their drives fill up.
Yes, I had understood you. I am translating into English with google and I think that sometimes I am not well understood. 
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