转自:https://cormachogan.com/2017/08/16/vmfs-6-large-small-file-blocks/

当VMware vSphere 6.5发布后,针对VMFS-6使用了2个Block来存放虚拟机VMDK文件,1MB的小文件块(SFB)和 512MB的大文件块(LFB)

当使用精简格式(thin provisioned)时,初始使用1MB Block;当使用厚置备(Thick provisioned)格式时,则尽可量使用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使用情况:

关于VMFS6 Block 1M & 512M 说明_第1张图片

详细信息可参考VMware 官方文档:https://storagehub.vmware.com/t/vsphere-storage/vsphere-6-5-storage-1/