If you cannot login to vCenter Server with the vSphere Web Client despite the server responding to pings, the appropriate next step is to check the status of the vCenter Server service. The service-control --status vmware-vpxd command allows you to determine if the vCenter Server service (vmware-vpxd) is running. If this service is not running, you won't be able to login to the vSphere Web Client, even if the server itself is responsive. Therefore, checking the status of this service is a crucial troubleshooting step.

When initially creating a cluster, the three features that can be configured are Proactive HA, DRS, and vSAN. Proactive HA is enabled to ensure high availability by proactively managing hosts that exhibit symptoms of failure. DRS is configured for load balancing and resource management. vSAN is configured for storage management within the cluster. Enhanced vMotion Compatibility (EVC) is typically configured after the cluster creation to ensure compatibility across different CPU generations.

To migrate the storage of a virtual machine, you need to: right-click the virtual machine and select Migrate, choose to change storage only, then select the format for the virtual machine's disks, choose the datastore to migrate to, select the destination network for all VM network adapters, and finally click Finish.

When configuring a virtual flash resource on a virtual machine, you can specify the block size and the reservation. The block size determines the size of the units of data for the flash resource, while the reservation allows you to set aside a specific amount of the flash resource to ensure it is always available for the virtual machine's use.