轉自：https://cormachogan.com/2017/08/16/vmfs-6-large-small-file-blocks/
當VMware vSphere 6.5發佈後，針對VMFS-6使用了2個Block來存放虛擬機VMDK文件，1MB的小文件塊（SFB）和 512MB的大文件塊（LFB）
當使用精簡格式（thin provisioned）時，初始使用1MB Block;當使用厚置備（Thick provisioned）格式時，則儘可量使用512MB Block。
（Thin disks created on VMFS-6 are initially backed with SFBs. Thick disks created on VMFS-6 are allocated LFBs as much as possible. For the portion of the thick disk which does not fit into an LFB,SFBs are allocated.）
在ESXi上使用命令 vmkfstools -P -v10 可以看到LFB使用情況：
詳細信息可參考VMware 官方文檔：https://storagehub.vmware.com/t/vsphere-storage/vsphere-6-5-storage-1/