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.Reference: https://www.google.pl/url?
sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwiF__u8zs7VAhUGYVAKHThiBlUQFggrMAE&url=htt
ps%3A%2F%2Fstoragehub.vmware.com%2Fexport_to_pdf%2Fvsphere-6-5-storage&usg=AFQjCNGb1qDxrz8FwAZsuVr5d9fB-i1Yg
D is correct
Reference ,
https://www.google.com.eg/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwjFuvbFn-bYAhXE_SwKHWZYAV0QFggvMAE&url=https%3A%2F%2Fstoragehub.vmware.com%2Fexport_to_pdf%2Fvsphere-6-5-storage&usg=AOvVaw3YMTWlK_mTRFAtA9Te7X7j
Page 5 :-
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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Block Size. The block size on a VMFS datastore defines the maximum file size and the amount of space a file occupies. VMFS5 and VMFS6 datastores support the block size of 1 MB.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.storage.doc/GUID-7552DAD4-1809-4687-B46E-ED9BB42CE277.html
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Answer B
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3
D is correct. B says “small and large” … only small is 1 MB.
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“Now VMFS-6 introduces two new internal block sizes concept for file creation. These are referred to as LFB (Large File Blocks) and SFB (Small File Blocks) and are used to back files on the VMFS-6 volume. This is not to be confused with the VMFS Block Size, which continues to be set to 1MB” https://cormachogan.com/2017/08/16/vmfs-6-large-small-file-blocks/
So, Block Size for VMFS6 datastore is 1MB (as visible also from vCenter).
However, answers in the question speak about small and large block size, which make me think they’re referring to the new enhanced feature of VMFS6/vSphere 6.5 (so what the exam is all about, thing not to forget when picking answers) .. so I’d go for answer D in this case.
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