Veritas-bu

Re: [Veritas-bu] Data Domain with Storgage Unit group question

2012-11-04 04:49:23
Subject: Re: [Veritas-bu] Data Domain with Storgage Unit group question
From: "stefanos" <smpt1 AT peppas DOT gr>
To: <VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU>
Date: Sun, 4 Nov 2012 11:48:58 +0200
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: 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 12:03 PM
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/datadomainsymantecnetbackupbestp
ractices.pdf

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