@Kajetan321 Hi, sorry. I am away from office and I can't tell you that off the top of my head right now. I get back to you during the week.

@ronan-a Unfortunately, the same issue persists even with a reduced MTU. We are experimenting with alternative solutions to replace a "commercial solution" on HCI infrastructure, and I am afraid that issues like this are unacceptable. I used Xen a long time ago and thought XCP-ng would be an excellent solution—and it very likely is, when used with a traditional storage system.