Checking the vSAN Health Service in the vSphere Client is the first step in diagnosing the issue and verifying the status of the vSAN components after the disk failure.
Rebuilding the affected disk group is necessary to ensure that data is re-optimized and replicated in accordance with the vSAN policy.
Replacing the failed disk with a new one ensures that the storage capacity is restored.
Ensuring that the new disk is claimed by the vSAN cluster is important to ensure that it is recognized and integrated into the vSAN disk group.

Setting up storage adapters, heartbeat mechanisms (for HA), and multipathing are important for stable operations. Mapping host USB drives (D) to production VMs is not typically a best practice and is rarely used in an enterprise environment.

High Availability (HA) protects against host failures by restarting VMs on other hosts, while DRS balances CPU and memory resources across hosts to optimize performance.

Once the vSphere Single Sign-On (SSO) domain is set up for a workload domain, it cannot be changed.
If you need the VI workload domain to use the same SSO domain as the management domain, you must create a new VI workload domain that is part of the management domain's SSO ring, and then migrate the workloads to the new domain.

Site Recovery Manager integrates with vSphere Replication or storage-based replication to automate failover and failback between sites. vSphere Replication alone doesn't orchestrate failover, Enhanced Linked Mode shares configuration between vCenters, and vRealize Orchestrator is a general automation platform.