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Re: [Xen-users] Re: 100% safe way to backup domU: (was Yet another backu

To: Ligesh <myself@xxxxxxxxxx>
Subject: Re: [Xen-users] Re: 100% safe way to backup domU: (was Yet another backup)
From: Nico Kadel-Garcia <nkadel@xxxxxxxxx>
Date: Fri, 12 Jan 2007 08:52:45 +0000
Cc: Ulrich Windl <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>, Mark Williamson <mark.williamson@xxxxxxxxxxxx>, Roger Lucas <roger@xxxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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Ligesh wrote:
  If we don't sync, we won't be able to mount and backup. If we were backing up 
the entire image, then yes, it will work without syncing.

  xm save domU file
  backup entire image + file
  xm restore file

  But if we want to mount and take proper incremental backup, we need the 
filesystem to be consistent. Otherwise we will get very badly corrupted data.

  Thanks.
Ahh. You've had to back up databases, I see. Even if the data is not badly corrupted, it's often in the databases where the corruption resides. And mounting and doing proper incrementals, you can *exclude* vast tracts of useless debris that are not worth storing or restoring.

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