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CBT and ABM

vRanger Pro 4.5. CBT and ABM. Image-Based Backup: Activities Impacting Performance. 1: Scanning. 3 : Writing. 2 : Reading. 0. 0. 0. 0. 0. How CBT and ABM work together. A typical disk layout, before 1 st backup. 0. 0. 0. 0. Active Block. Unallocated Block. 0. Zero Block.

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CBT and ABM

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  1. vRanger Pro 4.5 CBT and ABM

  2. Image-Based Backup: Activities Impacting Performance • 1: Scanning • 3: Writing 2: Reading 0 0 0 0 0

  3. How CBT and ABM work together A typical disk layout, before 1st backup 0 0 0 0 Active Block Unallocated Block 0 Zero Block 0 Changed Block Deleted Data

  4. Fulls: without CBT or ABM • All blocks must be scanned and read • Unallocated and zero blocks are both read as zeros • vRanger engine removes all “whitespace” on writes Scan and Read Write 0 0 0 0 0 0 0 Active Block Unallocated Block 0 0 Zero Block 0 Changed Block Deleted Data

  5. Fulls: with CBT • Does not scan unallocated blocks • Zeros and deleted blocks are scanned and read • vRangerengine removes “whitespace” on writes Scan and Read Write 0 0 0 0 0 0 0 0 0 0 Active Block Unallocated Block 0 0 0 0 Zero Block 0 Changed Block Deleted Data

  6. Fulls: with ABM • Does not scan zero nor deleted blocks • Unallocated blocks are scanned and read • vRanger engine removes un-allocated “whitespace” Scan and Read Write Active Block Unallocated Block Zero Block 0 Changed Block Deleted Data

  7. Fulls: with Both ABM and CBT • Scans the minimum set of blocks: no zero nor unallocated whitespace, no deleted blocks Write Scan and Read Active Block Unallocated Block Zero Block 0 Changed Block Deleted Data

  8. How CBT and ABM work together A typical disk layout, after 1st backup 0 0 0 Active Block Unallocated Block 0 Zero Block 0 Changed Block Deleted Data

  9. Incrementals: without ABM or CBT • All blocks are scanned • Only changed blocks are read • vRanger engine removes “whitespace” Scan and Read Write 0 0 0 Active Block Unallocated Block 0 Zero Block 0 Changed Block Deleted Data

  10. Incrementals: with CBT • Changed blocks are “presented” to vRanger by vSphere API • No scanning necessary • Only changed blocks are read and written From vStorage API Read and Write Active Block Unallocated Block Zero Block 0 Changed Block Deleted Data

  11. Incrementals: with ABM • Active blocks are presented to vRanger by Windows NTFS • Scanning includes only active and unallocated blocks (zero and inactive blocks are not included in the scan) • Only changed, active blocks are read and written Scanned Read and Written Active Block Unallocated Block Zero Block 0 Changed Block Deleted Data

  12. Incrementals: Both ABM and CBT together • No scanning • Only active and changed blocks are read and written From vStorage API Read and Written Active Block Unallocated Block Zero Block 0 Changed Block Deleted Data

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