4 Comments on “Which is the block size on the VMFS6 datastore?”

1. Max says:

   November 11, 2017 at 5:50 pm

   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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   1. LB says:

      November 14, 2017 at 1:55 pm

      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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2. rphcosta says:

   November 23, 2017 at 12:19 pm

   I think B too.

   
   
   
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   1. rphcosta says:

      November 25, 2017 at 5:28 pm

      Sorry… I wrong my answser… D is correct.

      Other source.

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

      
      
      
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