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How to determine sparseness or deduplication ratio of a file

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Category:
ontap-9
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core
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Applies to

  • ONTAP 9
  • NAS volume
  • Sparse file
  • Storage Efficiency Deduplication

Description

  • Sparse files set pre-allocated space within root inode but do not use any blocks
  • Examples for sparse files can be KVM/QEMU virtual disk files
  • ONTAP storage efficiency deduplication does reduce physical block usage for a file non-sparse data
  • Deduplicated size of a file can be inspected using ONTAP command volume file show-disk-usage on NAS volumes
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