VCP550 · Question #37
A vSphere administrator has created a Virtual SAN Cluster with Automatic Mode Disk Groups. The cluster includes three ESXi hosts contributing one SSD and six SAS disks each. The administrator has four
The correct answer is A. Add the four new hosts to the Virtual SAN Cluster and use the existing storage in the cluster.. In a vSAN cluster, hosts are not required to contribute local disks to participate and consume storage. The four new diskless hosts can join the existing cluster and use the capacity already contributed by the three original hosts.
Question
A vSphere administrator has created a Virtual SAN Cluster with Automatic Mode Disk Groups. The cluster includes three ESXi hosts contributing one SSD and six SAS disks each. The administrator has four new ESXi hosts that boot from a fiber channel array and have no local disks attached. These four new hosts need additional shared storage but there is insufficient space on the fiber channel array. The hardware budget is limited. What can the administrator do to provide the needed storage for the lowest cost?
Options
- AAdd the four new hosts to the Virtual SAN Cluster and use the existing storage in the cluster.
- BAdd an SAS RAID controller to each of the new hosts. Attach one SSD and six SAS disks to each RAID
- CAdd the four new hosts to the Virtual SAN Cluster and contribute the fiber channel disks to the Virtual SAN.
- DAdd the four new hosts to the Virtual SAN Cluster and change to Manual Mode Disk Groups.
How the community answered
(20 responses)- A65% (13)
- B5% (1)
- C10% (2)
- D20% (4)
Why each option
In a vSAN cluster, hosts are not required to contribute local disks to participate and consume storage. The four new diskless hosts can join the existing cluster and use the capacity already contributed by the three original hosts.
vSAN supports 'diskless' or 'compute-only' hosts that join the cluster without contributing storage capacity. The new hosts can be added to the existing vSAN cluster and immediately use the storage provided by the original three hosts, requiring no additional hardware purchases and therefore incurring the lowest possible cost.
Adding SSD and SAS disks to each new host would provide additional capacity but requires purchasing new hardware, which is unnecessary and contradicts the lowest-cost requirement when existing vSAN capacity is available.
Fiber channel disks attached to a host cannot be contributed to a vSAN disk group; vSAN requires locally attached storage (direct-attach) such as SAS, SATA, or SSD drives, not SAN-attached LUNs.
Changing to Manual Mode Disk Groups changes how disk groups are configured but does not add storage capacity for diskless hosts; it does not resolve the storage availability problem for the new hosts.
Concept tested: vSAN compute-only (diskless) host cluster membership
Source: https://docs.vmware.com/en/VMware-vSAN/index.html
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