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balma01
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dedup test

Post by balma01 »

About source side dedup, on the user guide I read: If some data block exists in the previous restore point for this VM, the source-side Veeam Data Mover does not transport this data block to the target
I'm testing it:
VM:1 win2012 with a disk with only a file1 filled with 10GB random chars
Backup job containing VM1 with no compression end dedup set to Local target
first run (full): read 32GB transfered 32GB (1x)
inside di VM I made a copy of the file1 filled with 10GB random chars
Now I think that the second run (incremental) has to read 10GB and to transfer almost nothing because the deduplication but:
second run (incremental): read 10GB transfer 10 GB (1x)

Why the deduplication did'n do anything?

Andreas Neufert
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Re: dedup test

Post by Andreas Neufert »

Likely because the blocks were not alligned on the storage side. The storage systems fils data as they get and if not alligned there is no similar block.
Maybe place the file on a second disk. Backup the VM. Clone the VM and then reattache the disk from the cloned VM as 3rd disk to the original VM (disk 2 and 3 are the same). Run Backup again.

Andreas Neufert
VP, Product Management
Posts: 4368
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Re: dedup test

Post by Andreas Neufert »

This one explains the background quite well :
https://blog.purestorage.com/say-goodby ... e-storage/

And here are the methods for the OS:
http://download.parallels.com/doc/psbm/ ... /33595.htm

balma01
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Re: dedup test

Post by balma01 »

Thanks Andreas
I just made the test suggested by you but the result is the same:
third run (incremental): read 10GB transfer 10 GB (1x)

Andreas Neufert
VP, Product Management
Posts: 4368
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Joined: May 04, 2011 8:36 am
Full Name: Andreas Neufert
Location: Germany
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Re: dedup test

Post by Andreas Neufert »

I would open a support ticket to verify settings and why it is not working. I guess you are sure that you have enabled "Inline data deduplicaton"

balma01
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Re: dedup test

Post by balma01 »

Yes, inline data dedup is enabled.
Thanks

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