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:
https://pubs.vmware.com/vsphere-65/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc%
2FGUID-98901BEE-8675-4D39-8AA2-E790EE341986.html
D – OK
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.
https://www.google.pl/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwiF__u8zs7VAhUGYVAKHThiBlUQFggrMAE&url=https%3A%2F%2Fstoragehub.vmware.com%2Fexport_to_pdf%2Fvsphere-6-5-storage&usg=AFQjCNGb1qDx-rz8FwAZsuVr5d9fB-i1Yg
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https://storagehub.vmware.com/export_to_pdf/vsphere-6-5-storage
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This is not to be confused with the VMFS Block Size, which continues to be set to 1MB.
B is correct
1
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The answer is nested in the first sentence:
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.
From the OJ's source.
Then the answer is D
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D
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B is correct.
SFB and LFB are internal concepts for files only.
VMFS-6 block size is still and always 1 MB
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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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D is correct:
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.
https://www.google.com.sv/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjdrKvi_-HYAhVKuVMKHTQeBbwQFggmMAA&url=https%3A%2F%2Fstoragehub.vmware.com%2Fexport_to_pdf%2Fvsphere-6-5-storage&usg=AOvVaw3YMTWlK_mTRFAtA9Te7X7j
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1MB
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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D is correct:
https://cormachogan.com/2017/08/16/vmfs-6-large-small-file-blocks/
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