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This figure shows a grid where K-safety is set to 3 with six elements contained within two replica sets: the elements within the host3.instance1, host4.instance1 and host5.instance1 data instances are part of a replica set 1; the elements within the host6.instance1, host7.instance1 and host8.instance1 data instances are within a replica set 2. The host3.instance1 and host6.instance1 data instances are within data space 1; the host4.instance1 and host7.instance1 data instances are in data space 2; the host5.instance1 and host8.instance1 data instances are in data space 3. However, since host4.instance1 has failed, so all transactions that include data within that replica set are sourced by the element in the host7.instance1 data instance.