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Wednesday, 10 February 2016

What is VMware VMFS 5?

  • VMware proprietary file system that is virtualization aware and optimized for virtualization. 
  • Supports concurrent access to shared storage. 
  • Can be expanded dynamically. 
  • Uses a 1 MB regular block size, for storing large virtual disk files. 
  • Uses sub-block addressing, storing small files: the sub-block size is 8 KB.
  1. If file size is less than 1 KB, file is stored in metadata space. No blocks/sub-blocks are used.
  2. If file size is more than 1 KB but less than 8 KB, sub-block is used to store the file.
  3. If file size is more than 8 KB, regular block is used.
  • Provides on-disk, block-level locking.
There 2 methods used under on-disk, block level locking as below.
    • SCSI Reservation
    • ATS (Atomic Test and Set) - Default method if your storage has VAAI plugin support.

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