You can group the two data domains to one storage unit group. BUT it is NOT recommended.
The benefit of deduplication does not come from the data that are the same across systems, but from the backups of the same system. Both data domains cannot cooperate together, and if a backup goes to the datadomains with a round robin group eventually you will end up with two datadomain having the same data, loosing space and overall deduplication ratio. It is better to use a strict client to datadomain relationship. I cannot find anything about storage unit group at your PDF and it is better to read this EMC PDF http://www.google.gr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB0QFjAA&; url=http%3A%2F%2Fwww.emc.com%2Fcollateral%2Fsoftware%2Fwhite-papers%2Fh7334- data-domain-boost-netbackup-wp.pdf&ei=BDaWUN5qwaLRBcnxgOAK&usg=AFQjCNHQTBQRX tFmddSdcGW1MxlbiJbRdA&sig2=G0W19IOKc4fLjYSVKBcs6g&cad=rja at page 7 says: As a best practice, EMC recommends using only the Failover Storage Unit selection criteria with Data Domain systems. Leveraging the selections Prioritized or Round Robin will not consistently send the same backups to the same system repeatedly, which will yield inferior deduplication ratios. With Failover, backups would be sent only to a standby Data Domain system in the event of a failure, resulting in optimal deduplication ratios. The efficiency of optimal deduplication ratios combined with N+1 failover for critically important backups is easily configured using Storage Unit Groups and the Failover selection criteria I hope that you understand what I'm saying. My English is not so good. Stefanos -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of xccess Sent: Saturday, November 03, 2012 12:03 PM To: [email protected] Subject: [Veritas-bu] Data Domain with Storgage Unit group question Netbackup 7.5 connect to Data Domain via OST, site A is primary site, and B is DR site, each site have two Data Domain 890, site A will using SLP policy to replicate the data off to site B. I want to group two DD890 on site A in a single "storage group unit" for SLP, but I was told it can't be done because data deduped won't be optimized when it go to site B, is this true? so far I read some of the docs and nothing suggest can't be group, and looking at this best practice page #10 have 3 DD write to two DD at the alternate site kinda suggest it can be group together as "storage group unit" if it on the same site. I just want to use the group so Netbackup can decide what to use rather then me try to assign it to the policy manually http://www.radiantresources.com/mydocuments/datadomainsymantecnetbackupbestp ractices.pdf +---------------------------------------------------------------------- |This was sent by [email protected] via Backup Central. |Forward SPAM to [email protected]. +---------------------------------------------------------------------- _______________________________________________ Veritas-bu maillist - [email protected] _______________________________________________ Veritas-bu maillist - [email protected] http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
