RE: RMAN convert 5TB db on Linux (Little Endian) to AIX (Big Endian) - alternatives?

  • From: "Taylor, Chris David" <ChrisDavid.Taylor@xxxxxxxxxxxxxxx>
  • To: "'rodrigo@xxxxxxxxxxxxxxx'" <rodrigo@xxxxxxxxxxxxxxx>
  • Date: Tue, 6 Mar 2012 13:34:54 -0600

That would be interesting if that would have worked, but AIX is one of the 
platforms where that won't work it appears.
Thanks again though

Chris Taylor

"Quality is never an accident; it is always the result of intelligent effort."
-- John Ruskin (English Writer 1819-1900)

Any views and/or opinions expressed herein are my own and do not necessarily 
reflect the views of Ingram Industries, its affiliates, its subsidiaries or its 
employees.

From: Rodrigo Mufalani [mailto:rodrigo@xxxxxxxxxxxxxxx]
Sent: Tuesday, March 06, 2012 11:05 AM
To: Taylor, Chris David
Cc: 'oracle-l@xxxxxxxxxxxxx'
Subject: Re: RMAN convert 5TB db on Linux (Little Endian) to AIX (Big Endian) - 
alternatives?

Hi Chris,

  Did you thougth about heterogeneous dataguard? Please check the Mike 
Dietrich's blog post at 
https://blogs.oracle.com/UPGRADE/entry/cross-platform_migration_using

  Check MOSC Note ID 413484.1  
https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&doctype=BULLETIN&idA3484.1

Best Regards,

Rodrigo Mufalani
Oracle Ace Member
http://www.mufalani.com.br
[http://mufalani.com.br/site/wp-content/uploads/2012/01/logo.png]



I was asked about converting a 5 TB 10.2 database on RHEL to a 11.2 database on 
AIX.
As I was thinking through this, I understand that to do the conversion from 
Linux to AIX the database would have to be
at the same version. So, I'd either have to upgrade prior to moving, or after. 
Then I was thinking about the RMAN
conversion speed to convert from little endian to big endian and I think I 
would have a problem due to the time
required.

I don't have access to the exact I/O throughput on the system but if I can 
convert 4 GB in 14 minutes (stats taken
from a white paper) through RMAN, that's close to 1/3 GB per minute. So I could 
do 1 GB = 3 minutes. (Should I expect
more than 1/3 GB per minute?)

So, if I have 1 TB (approx. 1000GB) that would 3000 minutes. Now if I have 5 
TB, that's 15,000 MINUTES (!) to convert
through RMAN.

Is that really my only option (or best option anyway)?

What other options should I explore?



Chris Taylor

"Quality is never an accident; it is always the result of intelligent effort."
-- John Ruskin (English Writer 1819-1900)

Any views and/or opinions expressed herein are my own and do not necessarily 
reflect the views of Ingram Industries,
its affiliates, its subsidiaries or its employees.


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