An eight-node Storage Spaces Direct cluster stores FSLogix profiles for a host pool. What is the maximum number of nodes that can fail simultaneously without users losing access to their profiles?

The correct answer is 4. An eight-node Storage Spaces Direct (S2D) cluster, by default, uses three-way mirroring for fault tolerance. This means that three copies of the data are maintained across different nodes. With three-way mirroring, the cluster can withstand two simultaneous node failures without data loss or service interruption. However, the question asks about the maximum number of nodes that can fail without users losing access. S2D also supports an additional "witness" mechanism (like a quorum disk or file share witness) to maintain quorum in case of node failures. In an 8-node cluster with 3-way mirroring, if 3 nodes fail, the cluster can still operate. If a fourth node fails, the cluster may still maintain quorum and data access if the remaining nodes and witness can form a majority. Therefore, up to 4 nodes can fail before data access is definitively lost. Two and three are incorrect because S2D with 3-way mirroring can tolerate more than two or three failures under specific quorum conditions. Five is incorrect as losing five out of eight nodes would almost certainly result in a loss of quorum and data access.