We have been playing with the new dedup option in a small test environment pushing data from 2 clients through a windows 2008 media server to a 2TB lun presented to that same server.  We have things setup to dedup at the media server, not the client and have each of these 2 clients in their own policy.

 

After the initial full backup of these clients, netbackup reported 98-99% deduplication on subsequent fulls we ran which is fantastic.  However, even with these numbers inside NBU, the amount of storage being used seems excessive (currently over 80%).  Support are telling me that it can take several weeks for the math behind the numbers to actually start accurately reporting the compression figures but I guess I don’t understand how 2 clients which total about 850GB and have a  minimal change rate, when reporting 98 or 99% compression inside NBU, can be using so much space.

 

Does anyone else have any experience with the dedup option and did you see similar disparity after your initial implementation ?

 

As a point of reference, when setting up the disk pool, we took all the defaults inside the wizard.

 

Thanks in advance  

 

Mark Glazerman

Enterprise Storage Administrator

Spartech Corporation

Desk: 314-889-8282

Fax: 314-854-8282

Cell: 618-520-3401

mark.glazerman AT spartech DOT com

http://www.spartech.com

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