VMware 3V0-23.25 Exam With Confidence Using Practice Dumps

When vSAN Data-at-Rest Encryption uses an external KMS, vCenter requests a Key Encryption Key (KEK) from the KMS and stores only the key ID, not the key itself. ESX hosts use the KEK to decrypt the Data Encryption Keys that protect the encrypted vSAN disk data. If a host reboots, it must retrieve the KEK from the KMS before its encrypted vSAN disk groups can be mounted. The guide states that when a host reboots, it does not mount its disk groups until it receives the KEK. Key persistence can allow continued operation when the key server is unavailable, but the documented persistence mechanism relies on TPM-backed key persistence across reboots. In this scenario, the host does not have a Trusted Platform Module and the KMS is temporarily unavailable. Therefore, the ESX host can boot, but the encrypted storage remains unavailable and unmounted until communication with the KMS is restored. Reference topics: vSAN Data-at-Rest Encryption, External KMS, Key Encryption Key, Encryption Key Persistence.

The cluster must not include hosts from different subnets or networks (L3).

The default management vSphere cluster must already be stretched.

The cluster must not include DPU-backed hosts.

The cluster must not share a vSAN Storage Policy with any other cluster.

To stretch a vSAN cluster in a VCF Workload Domain, the environment must satisfy specific VCF stretch prerequisites and avoid unsupported configurations. The default management vSphere cluster must already be stretched so the management plane remains available if an availability zone fails. The workload cluster must not include hosts from different subnets or Layer 3 networks because the stretch workflow expects supported site and network placement assumptions for the cluster being stretched. The cluster must also not include DPU-backed hosts, because clusters with DPU-backed hosts are excluded from this stretch operation. In addition, the cluster must not share a vSAN Storage Policy with any other cluster, because shared policies can create policy scope and compliance conflicts during stretch configuration. SSH does not need to be manually activated on all hosts as a prerequisite. The default management cluster being “not stretched” is the opposite of the required condition. Host self-signed certificates are not the listed blocking condition for this workflow. Reference topics: Stretch vSAN Cluster in VCF, Workload Domain Stretch Prerequisites, vSAN Storage Policy Constraints, Unsupported Stretch Configurations.

Four hosts are required to meet the 12 TB usable-capacity requirement after applying the protection policy, data reduction, reserves, and overhead. Each host contributes 8 TB raw capacity from two 4 TB NVMe devices. Three hosts provide 24 TB raw capacity, but once host rebuild reservation, 10% operational reserve, RAID-5 protection overhead, and 25% filesystem/object overhead are considered, the remaining effective usable capacity falls below the required 12 TB target. Four hosts provide 32 TB raw capacity. With vSAN ESA and FTT=1/RAID-5, vSAN uses erasure coding to improve capacity efficiency compared with mirroring. The vSAN sizing guidance states that RAID-5 with FTT=1 provides approximately 75% usable capacity before other reserves and overhead. Host Rebuild Reserve must also be planned so the cluster has enough free capacity to rebuild components after a host failure. After applying the expected 1.5 data reduction ratio and the required reserves, four hosts provide enough usable capacity while three hosts do not. Reference topics: vSAN ESA Capacity Sizing, RAID-5 Erasure Coding, Host Rebuild Reserve, Operations Reserve, vSAN Object Overhead.