RE: EMC Data Deduplication
- From: <rajendra.pande@xxxxxxx>
- To: <jrkhym@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 5 Nov 2010 09:01:11 -0400
In short DD is quite useful. It does mean that you will have to
understand what the device's capability are and how it will change your
practices.
I was told by our backup folks that with DD you can get upto 50 times
compression and typically for something like ORACLE database files where
the percentage changes are small you also get a lot of de-duplication.
If your database is an edge case where say 60-70% of the data changes
then you only get the benefit of compression.
Note also that unlike RMAN the compression is happening on the DD
device.
I think DD will give you huge benefits - especially for ORACLE with
incremental backup. You just have to look at it a bit different that the
current way of doing things
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jason Khym
Sent: Friday, November 05, 2010 5:55 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: EMC Data Deduplication
I am an oracle DBA at a large ulitity company in the Southeastern US.
Our IT shop is considering buying this product for our server,email and
database backups. It would replace Veritas Netbackup Server and Tape
libraries. I was wondering if anyone on the list has any experience
with the product.
We current at taking full level 0 hot backups on all of our production
databases every night. So I know a dedup product like this would save us
alot of backup space. I also realize that RMAN incremental backups with
Block Change Tracking would give us the same benefit with less cost. We
haven't had time to implement this as a backup standard yet. Our db
engineer tried using incremental backups back in 8i or 9i and said it
was not reducing the backup size. He later found out he needed to
enable BCT to see the full size reduction. Our IT engineers want
us(DBAs) to write RMAN backups directly to this dedup servers. I am not
sold on that idea. I would like to continue to write our backup to ATA
SAN storage and have the backups pulled to the dedup devices.
Overall, what do you think of this product? Any gotchas or leasons
learned that can be shared?
Please visit our website at
http://financialservicesinc.ubs.com/wealth/E-maildisclaimer.html
for important disclosures and information about our e-mail
policies. For your protection, please do not transmit orders
or instructions by e-mail or include account numbers, Social
Security numbers, credit card numbers, passwords, or other
personal information.
Other related posts:
