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 10/28/2014 12:06 AM
 
 Modified By SimonBryan  on 10/27/2014 10:08:53 PM
I am running the Advanced version of vBackup, on most of my guests it seems to behave as expected but I have noticed that on one server whihc has 15GB of drive USED the backup now uses 100gb

relevant info may be that it has a drive excluded from the backup, which when I Mount the Drive to check seems to have worked, it also used to have two other drives that have been removed (both virtual disks). It has not been rebooted since the removal as the system did not require it.

The mounted drive has two volumes as expected a System Recovery and my C drive as Volumes 1 and 2.

I have excluded 'Hard Drive 2' as that is what is listed in Esxi.

Any thoughts?


Have just noticed another one where the used space is 77GB but the backup is 170GB - both backups using 'Basic'
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 10/30/2014 5:04 PM
 
It seems that on these drives the compression is no longer working and they are performing as if I did not have the licensed verison. Note that I am also having trouble with mounitng the backups now - in another thread.
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 10/30/2014 10:17 PM
 

Most likely these disks have had files on them that have been deleted. If so, now even though the quest OS is no longer maintaining pointers to the files they are still present on the disks (just like if you were dealing with a physical hard drive). Basic compression removes the "white space" as the backup copy of the disk is created. Basically creating a thin-provisioned clone. Since the free space, as reported by the OS, is really no longer "white" it is maintained in the backup copy.

We have not tested this yet, but you might look at SDelete from Sysinternals (http://technet.microsoft.com/en-us/sy...). By "re-zeroing" the unused space on the disk you might be able to get your backups to compress as they did before. Can you research and try this and let us know if it helps?

Just to be safe please be sure to make a good backup of your VM's before you try this or maybe try this on a restored clone.

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 11/2/2014 6:17 PM
 
Thanks for that info
Ran sdelete as suggested, took a while, but whne complete re-ran the backup and it has shrunk back to a normal size again. Guess the advice was spot on!
Happy vBackup user! :-)
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