RE: best way to convert from unix to linux

From: Josh Collier <>
Date: Fri, 25 May 2012 16:43:31 +0000
Message-ID: <D0534F8D31056242BE8E38FA9413FDA817CF14AB_at_M1EXCHMB12.mmi.local>

The white paper was very helpful due to the importance of the order of operations. Its scripts to capture sequences, grants and the two different metadata imports.

Another thing I learned is that on linux statistics_level=ALL behaves dramatically much worse than on solaris. Its unusable on redhat 5 update 4.

Also run rman logical block checking on the source prior to export to determine if you have any corrupt blocks on the source. Corrupt blocks make TTS with endian conversion upset.

Send me a message, I can send over my scripts if you like.

If your storage subsystem is up to it, you should have no trouble moving it in 8 hours. That's about how long it took me to move 7TB. 4 hours for endians and 2 hours on pre and post work.

Plan on 5 or 6 test runs to work out kinks. Some objects don't come over, like domain indexes and dblink dependent objects sometimes get upset. Josh C.

-----Original Message-----

From: [] On Behalf Of Taylor, Chris David Sent: Friday, May 25, 2012 5:14 AM
To: ''; '' Subject: RE: best way to convert from unix to linux

Here is a thread that I started discussing moving from Linux to AIX (little endian to big endian). In your case, you are going the other way.,19

Hat Tip to Josh Collier who posted the following information in that thread (specifically the whitepaper):


-----Original Message-----

From: Josh Collier [mailto:Josh.Collier_at_xxxxxxxxxxxx] Sent: Wednesday, March 07, 2012 1:10 PM
To: Taylor, Chris David; 'sandeep salian' Cc: 'oracle-l_at_xxxxxxxxxxxxx'
Subject: RE: RMAN convert 5TB db on Linux (Little Endian) to AIX (Big Endian) - alternatives?

I used this white paper to move 8tb from big to little endian.

it worked great. Rman endian conversion on the target took 4 hours.

However, I suggest doing a lot of testing I found bugs in the following areas:

TTS with compressed tables (bug 10324526) TTS and flashback (bug 12619529)

The latest PSU is essential to avoid catching more bugs.

Run DBV and RMAN logical block validation on the database after the conversion is also essential. Also using db_block_checking is helpful to find bugs during test.

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.

-----Original Message-----

From: [] On Behalf Of Dustin Hayden Sent: Friday, May 25, 2012 6:14 AM
Subject: best way to convert from unix to linux

I have a 3TB database that needs to be moved from hp-ux to linux. I need to know the fastest way to do this. Tried doing a datapump export (parallel 6) and it took over 36 hours which is too long. Really need to be able to this is in under 24 hours.

Can anything be done with any kind of replication or rman? Keep in mind there is a page layout issue going from unix to linux.




-- Received on Fri May 25 2012 - 11:43:31 CDT

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