14.5.15. Using blockcommit to Shorten a Backing Chain

Procedure 14.2. virsh blockcommit

• Run the following command:

  # virsh blockcommit $dom $disk -base snap1 -top snap2 -wait -verbose

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  The contents of snap2 are moved into snap1, resulting in:
  base ← snap1 ← active. Snap2 is no longer valid and can be deleted

  Warning

  blockcommit will corrupt any file that depends on the -base option (other than files that depend on the -top option, as those files now point to the base). To prevent this, do not commit changes into files shared by more than one guest. The -verbose option allows the progress to be printed on the screen.