This figure shows a grid where K-safety is set to 1 with three elements contained within three replica sets: the element within the host1.instance1 is part of a replica set 1; the element within the host2.instance1 is part of a replica set 2; the element within the host3.instance1 is part of a replica set 3. All data instances are in the same data space. However, since the element within the host2.instance1 data instance has failed, all transactions that include data within this element is blocked.