Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Update: today's check found 1 block from yesterday and 3 new blocks. Source is again node1 and dest node2 but now It's a Windows VM. And same thing again: zeros "not replicated". Non-zero part from node1 (I'm talking about 3 blocks, that means 24 sectors by 512 bytes each) completely the same as on node2, but zeros of node1 are not zeros on node2.