Good day!
Thank you timonych!
Successfully deployed working xpenology from vzdump-qemu-xpenology-3615xs-6.2.3_25426.vma.lzo image.
Everything works, but faced a wild drop in network performance.
The established speed is like a 100 megabit connection, although I use only gigabit connections everywhere.
I tried to use E1000 and vmxnet3 in the virtual machine (the rest did not work). There is no difference, unfortunately.
I sinned on the hard drive, but at a known working and fast speed they did not change...
What can be wrong?