An all-flash vSAN ESA cluster contains four nodes.
Which two storage policies can the cluster satisfy? (Choose two.)
An all-flash vSAN ESA cluster contains four nodes.
Which two storage policies can the cluster satisfy? (Choose two.)
In a vSAN ESA cluster with four nodes, the storage policies that can be satisfied are FTT=1 (RAID-5 Erasure Coding) and FTT=1 (RAID-1 Mirroring). This is because FTT=1 (RAID-5 Erasure Coding) requires a minimum of four nodes to distribute data and parity information, providing tolerance for one node failure. Similarly, FTT=1 (RAID-1 Mirroring) requires at least three nodes, where data is mirrored to one other node to offer redundancy. Policies like FTT=2 or FTT=3 would require more than four nodes to achieve the necessary replication and redundancy.
-FTT=3R1 needs 7 nodes 2*3+1 FTT=2R1 needs 5 nodes 2*2+1 FTT=2R6 needs 6 nodes (2*2+1)+1 FTT=1 EC is 4 nodes min FTT=1 Mirror is 3 nodes min
C D correct
Here is why: https://download3.vmware.com/vcat/vmw-vcloud-architecture-toolkit-spv1-webworks/index.html#page/Storage%20and%20Availability/Leveraging%20vSAN%20for%20Highly%20Available%20Management%20Clusters/Leveraging%20Virtual%20SAN%20for%20HA%20Management%20Clusters.3.09.html
With 4 hosts, only C and D are possible on a vSAN ESA cluster. D would be also possible on a vSAN OSA cluster (RAID-5 FTT1 would need at least 5 hosts in this case). RAID-1 with FTT 2 and FTT 3 need respectively 5 and 7 hosts as a minimum. RAID-6/FTT 2 needs at least 6 hosts So answers C and D are correct. https://core.vmware.com/resource/vmware-vsan-design-guide
The ability to satisfy specific storage policies in a vSAN cluster depends on the cluster's configuration and the type of storage devices used. For an all-flash vSAN ESX cluster with four nodes, typical configurations would allow for: B. FTT=2 (RAID-1 Mirroring): This policy would replicate data across two different nodes in the cluster, providing data redundancy. In a four-node cluster, this is achievable. D. FTT=1 (RAID-1 Mirroring): This policy would replicate data across one other node, which can be satisfied in a four-node cluster. However, the suitability of other policies like FTT=3 (RAID-1 Mirroring) or FTT=2 (RAID-6 Erasure Coding) would depend on the specific configuration, number of nodes, and the capacity and redundancy requirements of your cluster. It's important to choose storage policies that align with your cluster's capabilities and your organization's needs.