I think what you are being told is accurate, but that you have misinterpreted
it slightly.
You can certainly use two (or more) Data Domain OST storage units within a
storage unit group.
Any data written to a Data Domain will be replicated from siteA to siteB via
OST Optimized Duplication (OptDup).
This will happen regardless of whether your policy had the OST storage unit
defined or a storage unit group defined.
What you will not get by using a storage unit group is the concept of "global
dedup" at a site.
Within a site, any backups written to DD1 will NOT be deduplicated against the
backups written to DD2.
Within a single DD, you still get dedup across all images.
If it were my environment, I would try to group based on data type rather than
using a storage unit group and spraying the backups across both DDs within a
site.
Group all the Windows on one and Unix on the other.
Or Databases on one and general filesystems on the other.
You'll need two SLPs - because each SLP needs to specify the source DD and
destination DD.
You will want to maintain the grouping of data (Windows/Unix or
Databases/Filesystems) on the DDs at site B.
-daniel
-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of xccess
Sent: Saturday, November 03, 2012 5:03 AM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
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/datadomainsymantecnetbackupbestpractices.pdf
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