Core technologies VMware backups - Eric Siebert

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Core technologies VMware backups - Eric Siebert

  1. 1. Core Technologies used for Virtual Machine Backup<br />Eric Siebert<br />vExpert, Author, Blogger<br />Blog: http://vsphere-land.com<br />http://searchvmware.com<br />Twitter: @ericsiebert<br />
  2. 2. About the speaker<br />25 year IT industry veteran.<br />vSphere Land blog: http://vmware-land.com/<br />Author of popular books<br />Contributor to industry publications<br />vExpert nomination<br />
  3. 3. Agenda<br />Virtual Environment Backup Methods<br />Virtual Machine Snapshots<br />Disk-to-Disk Backups<br />Volume Shadow Copy Service (VSS)<br />vStorage APIs<br />Data Deduplication<br />Data Compression<br />
  4. 4. Virtual Environment Backup Methods<br /><ul><li>Virtualization introduces more options and flexibility
  5. 5. Drastically different than physical infrastructures
  6. 6. Traditional backup approach can create bottlenecks</li></li></ul><li>Image Level Backups<br /><ul><li>Key difference with VM backups</li></ul>VM disk blocks<br /><ul><li>Image-level backups don’t need OS agents
  7. 7. More efficient to backup VMDKs via virtualization layer
  8. 8. Image-level backups are complete VM
  9. 9. Image-level backups are at block level
  10. 10. Empty disk block detection
  11. 11. Changed disk blocks</li></li></ul><li>Virtual Machine Snapshots<br />Point-in-time picture of a VM<br />VM disks become read-only during a snapshot<br />Writes are redirected<br />Changes merged into source<br />
  12. 12. Deleting Virtual Machine Snapshots<br />Process has changed with different vSphere versions<br />Helpersnapshot is created to hold disk writes<br />Snapshot 1 grows to 23 GB<br />Snapshot 2 grows to 18 GB<br />1<br />2<br />4<br />3<br />Snapshot 3 disk data file 10 GB<br />Snapshot 2 disk data file 8 GB<br />Snapshot 1 disk data file 5 GB<br />Helper Snapshot disk data file 1 GB<br />Original VM disk data file 60 GB<br />
  13. 13. Deleting Virtual Machine Snapshots<br />In later vSphere 4.1 & later 4.0 versions, each snapshot is merged directly back into the original disk in turn<br />
  14. 14. Virtual Machine Snapshot Size<br /><ul><li>Snapshot files grow over time in 16 MB increments
  15. 15. Single snapshot file can never exceed size of source disk
  16. 16. Additional changes will change the same block
  17. 17. Multiple snapshot can exceed the size of source disk
  18. 18. Growth rate determined by disk write activity</li></ul>Snapshot 2<br /><<br />+<br />><br />Snapshot 4<br />Snapshot 1<br />Snapshot3<br />
  19. 19. Want more?<br />See the rest and watch more training videos at www.backupacademy.com<br />

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