Which storage policy can be assigned to virtual machines in a 5-node, all flash vSAN cluster, to provide the highest level of redundancy?
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A. B. C. D.B.
In a 5-node all-flash vSAN cluster, the highest level of redundancy can be achieved by assigning the storage policy that provides protection against the maximum number of simultaneous failures. The options available in the given choices are as follows:
A. 1 failure - RAID-5 (Erasure Coding) RAID-5 is an erasure coding technique that provides protection against a single disk failure. In a 5-node cluster, RAID-5 provides a parity-based protection scheme, where one of the five disks in each stripe is used for parity. This allows for the reconstruction of the lost data if one of the disks in the stripe fails. However, if a second disk fails before the first one is rebuilt, the data would be lost.
B. 2 failures - RAID-6 (Erasure Coding) RAID-6 is an erasure coding technique that provides protection against two simultaneous disk failures. In a 5-node cluster, RAID-6 uses two parity disks per stripe to protect against the failure of any two disks in the cluster. This provides a higher level of protection than RAID-5, but requires more disk overhead.
C. 2 failures - RAID-1 (Mirroring) RAID-1 is a mirroring technique that provides protection against a single disk failure. In a 5-node cluster, RAID-1 mirrors the data on each disk to a second disk, effectively halving the usable capacity. This provides protection against the failure of any one disk in the cluster, but not against the failure of two disks.
D. 3 failures - RAID-1 (Mirroring) RAID-1 with three-way mirroring provides protection against the failure of any two disks in the cluster. This requires triple the disk overhead compared to a single-copy policy, but provides the highest level of protection against simultaneous disk failures.
Therefore, the storage policy that can be assigned to virtual machines in a 5-node, all-flash vSAN cluster to provide the highest level of redundancy is option D - 3 failures - RAID-1 (Mirroring).