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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