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.
In order to assign more than 4 TB of RAM to a virtual machine in vSphere 6.5, the virtual machine's compatibility needs to be upgraded to version 13. This version supports configurations that allow this amount of RAM. Upgrading the VM compatibility ensures the virtual machine can take advantage of the features and hardware capabilities in vSphere 6.5.
Checking the VMware Hardware Compatibility List ensures that the new storage solution is supported and compatible with the ESXi hosts, while verifying that the drivers and firmware are at the recommended versions ensures that the hardware and software can work together efficiently. These steps are crucial for troubleshooting and optimizing performance.