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VRanger, since version 7.1, including 7.3, doesn't actually use Active Block Mapping to run backups.

support_52232
over 8 years ago

Since the very first install and through 7.3, VRanger must read the entire VM disk group in order to make a backup. In my case I have 8 VM's with a total of 12TB of space allocated to the Win 2012 R2 volumes in those VM's.

 

The backup must, by time and appearance, read every block of those volumes in order to determine if anything has changed. This means that when using VRanger to do backups, that the backups take 10 hours of a 10GB ethernet connection.

 

I've had this issue since version 7.1 installed in 2014. I have completely uninstalled, reinstalled, etc...

 

After switching to Veeam a full backup takes 3 hours, incremental backups take 20 minutes, for the same VM's. I still have a Vranger contract and have been extremely disappointed with the performance.

 

I see that 7.5 is out and I'll test it, but I don't expect ABM to actually work in 7.5 when it hasn't worked in 7.1 to 7.3.

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  • 0 over 8 years ago
    As a side note - I installed 7.5, enabled CBT in the job, and then ran two, back to back. Both jobs took the same amount of time (differential) and both wrote the same amount of data to the backup repository. Since the server I backed-up has little data change, since it was done twice, both were differential, I expected the second immediate differential to take less time and to use less repository space.

    Doing this with Veeam the backup, differential, with change detection, always takes less time and uses less space for a differential followed immediately by the same differential.
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  • 0 over 8 years ago
    As a side note - I installed 7.5, enabled CBT in the job, and then ran two, back to back. Both jobs took the same amount of time (differential) and both wrote the same amount of data to the backup repository. Since the server I backed-up has little data change, since it was done twice, both were differential, I expected the second immediate differential to take less time and to use less repository space.

    Doing this with Veeam the backup, differential, with change detection, always takes less time and uses less space for a differential followed immediately by the same differential.
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