Which is the block size on the VMFS6 datastore?

Which is the block size on the VMFS6 datastore?

Which is the block size on the VMFS6 datastore?

A.
All small and large file blocks are 8MB.

B.
All small and large file blocks are 1MB.

C.
Small file blocks are 512KB. large file blocks are 64MB.

D.
Small file blocks are 1MB, large file blocks are 512MB.

Explanation:
File Block Format
VMFS-6 introduces two new block sizes, referred to as small file block (SFB) and large file block (LFB).
While the SFB size can range from 64KB to 1MB for future use-cases, VMFS-6 in vSphere 6.5 is utilizing an
SFB size of 1MB only. The LFB size is set to 512MB.
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Max

Max

Correct is B.

Source: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.storage.doc/GUID-98901BEE-8675-4D39-8AA2-E790EE341986.html

Block size

The block size on a VMFS datastore defines the maximum file size and the amount of space the file occupies. VMFS6 supports the block size of 1 MB.

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LB

LB

correct answer is D

see page 5: https://storagehub.vmware.com/export_to_pdf/vsphere-6-5-storage

“File System Resource Management
File Block Format
VMFS-6 introduces two new block sizes, referred to as small file block (SFB) and large file block (LFB).
While the SFB size can range from 64KB to 1MB for future use-cases, VMFS-6 in vSphere 6.5 is
utilizing an SFB size of 1MB only. The LFB size is set to 512MB.
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.
These enhancements should result in much faster file creation times. This is especially true with swap
file creation so long as the swap file can be created with all LFBs. Swap files are always thickly
provisioned.”

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