Question
You have a server named Server1 that runs Windows Server. Server1 has a just-a-bunch-of-disks (JBOD) enclosure attached.
You plan to create a storage pool on Server1 and a virtual disk that will use a mirror layout.
You are considering whether to use a two-way or a three-way mirror layout.
What is the minimum number of disks required for each type of mirror layout? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:
Explanation
Two-way mirror: 2 — A two-way mirror in Storage Spaces writes two identical copies of every slab, so the storage pool must contain at least two physical disks in the JBOD enclosure to hold those copies on separate devices; the layout then tolerates the loss of a single disk. Choosing 1 is impossible because a single disk cannot hold two independent copies, and higher numbers exceed the minimum Windows Server enforces.
Three-way mirror: 5 — Although a three-way mirror keeps three copies of the data, Storage Spaces requires a minimum of five physical disks for this layout so the pool can survive two simultaneous disk failures and still have capacity to repair and redistribute the remaining copies. Answering 3 is the common mistake: three disks match the number of data copies but fall short of the five-disk minimum that Windows Server requires when creating a three-way mirror virtual disk.
