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
4
2
Correct: D
4
2
B is correct.
SFB and LFB are internal concepts for files only.
VMFS block size is still and always 1 MB
1
5
Correct, B is the answer
0
4
Why do you supposed the “B” answer has the “file block” language in it? Wouldn’t it just say “the block size is 1 MB”?
How would the question be worded differently for the correct answer to be D?
2
0
You’re right, I also asked a friends of mine and he confirmed checking the official source: “VMFS6: Uses 1 MB and 512 MB block sizes that are good for storing large virtual disk files.”
2
0
B is it… https://forums.itpro.tv/topic/1471/vmfs-6-block-size
0
1
*D*
However, its a very tricky question… the answer is in small file blocks vs. large file blocks vs block size. From Cormac (Director and Chief Technologist in the Office of the CTO in the Storage and Availability Business Unit (SABU) at VMware):
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.
The SFB size is set to 1MB; the LFB size is set to 512MB.
https://cormachogan.com/2017/08/16/vmfs-6-large-small-file-blocks/
8
0
Agree with that. Question ask just about “block size” on VMFS6, which is 1MB, but answers are about “file blocks”, which are 1MB for SFB and 512MB for SMB (as per the link above of Cormac Hogan, who knows his stuff and is always a pleasure to listen and follow).
So I’d go for D as well
1
0
The “B” is correct.
https://www.briefmenow.org/vmware/which-is-the-block-size-on-the-vmfs6-datastore-3/
“When thin disks are created on VMFS-6, these thin files are NOW initially backed by SFBs”
0
1
Sorry, Sorry.
In fact it is the “D” reading the link text better, I saw that it depends on the type of the disk. All Thin disks vmdk, using 1MB, and Thick discs, will probably use 512KB blocks.
“The SFB size is set to 1MB; the LFB size is set to 512MB. When thin disks are created on VMFS-6, these thin files are now initially backed by SFBs. When Eager Zero Thick (EZT) or Lazy Zeroed Thick (LZT) files are provisioned on VMFS-6, these thick files are allocated LFBs as much as possible. If all of a thick file cannot be backed by LFBs, then SFBs are used to back the portion of the thick disk that does not fit into an LFB”
1
0