[SunHELP] rsync for one time Oracle data migration to new array

listmail listmail at triad.rr.com
Wed Sep 20 10:46:49 CDT 2006

I need a little feedback on a proposal I've made to management which 
involves migrating an Oracle E-business suite installation from an older 
EMC FC4700 to a CX500 storage array.  One option proposed by EMC was to 
use LVM mirroring and detach later while the system was down.  This does 
sound good because it allows to bring the system up while resyncing.  We 
don't use Vertitas Volume manager for unlisted reasons and while I do 
use SDS for the root OS mirrors and have a had good success with it, I 
do not like altering my source data or access methods in any manner that 
could jeopardize it's integrity.  I have cloned these installations many 
times both locally an across the wire using rsync and haven't had 
anything crop up which would lead me to believe my data was not 1 to 1.  
What I have proposed was that I'd do an initial sync of the files during 
the day to get the majority of the work done before a migration weekend 
and then while the system was down that weekend I would have rsync copy 
or delete what it needs on the target to get things 1:1 with the 
source.  Since the Oracle database files are every changing and large 
I've chosen to skip these files until we are down and executing the 
migration.  One of the questions I was asked by management was if rsync 
had any directory depth limitations.  My initial response is that I 
think rsync would complain if it ran into something like and I also 
believe that rsync would use up the system memory before it ran into a 
depth limitation.  I'm pretty certain that their isn't any particular 
file type (ie links etc) that rsync does not handle correctly.  I think 
with both approaches most of the concerns lie within mapping the luns 
correctly, copying the data to the right luns which are assigned the 
right servers and making sure all relevant mount points for each server 
are considered.

Do you guys have any feedback on this?  Its fuel to fire or perhaps 
things I should consider.


2 servers Solaris 9, 2 Solaris 8
all running rsync 2.6.8

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