資訊組長

Vmware Snapshot Pratical Experience

 

  • 不要將「快照」作為「備份工具」
  • 快照最多32份。然而,若要有較佳的效能,那就僅使用二至三個快照
  • 不要使用一個單一快照超過72小時
  • 使用第三方軟體要確認成功「備份」後,快照是否被刪除

 

 

Follow these best practices when using snapshots in the vSphere environment:

  • Do not use snapshots as backups.

    The snapshot file is only a change log of the original virtual disk, it creates a place holder disk, virtual_machine-00000x-delta.vmdk, to store data changes since the time the snapshot was created. If the base disks are deleted, the snapshot files are not sufficient to restore a virtual machine.
     
  • Maximum of 32 snapshots are supported in a chain. However, for a better performance use only 2 to 3 snapshots. 
     
  • Do not use a single snapshot for more than 72 hours.

    The snapshot file continues to grow in size when it is retained for a longer period. This can cause the snapshot storage location to run out of space and impact the system performance. 
     
  • When using a third-party backup software, ensure that snapshots are deleted after a successful backup.

    Note: Snapshots taken by third party software (through API) may not appear in the Snapshot Manager. Routinely check for snapshots through the command-line.
     
  • Ensure that there are no snapshots before:
    • Performing Storage vMotion in vSphere 4.x and earlier environments.

      Note: vSphere 5.0 and later support Storage vMotion with snapshots on a virtual machine.
       
    • Increasing the virtual machine disk size or virtual RDM. 

      Increasing the disk size when snapshots are still available can corrupt snapshots and result in data loss.

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