Migration databases from one server to another

Hi All
I want to migrate our 8 production databases from one server to another server. these are in RAC .Details are below
OLD SERVER: -
OS: REDHAT LINUX 3
ORACLE: ORACLE 10gR1
FILE SYSTEM : OCFS
STORAGE: SAN
Its a RAC databases
NEW SERVER: -
OS: REDHAT LINUX 5
ORACLE: ORACLE 11g R2
FILE SYSTEM:ASM
STORAGE:SAN ( fresh one)
Its also RAC DATABASES
So please tell me the best method to migrate 8 databases from old server to another server . all databases size are not more than 50 GB.
All servers details are above .please let me know if you require any other details
please reply soon we have to do it on urgent basis

Since all your databases are small (< 50G), I would recommend using expdp/impdp - http://download.oracle.com/docs/cd/E11882_01/server.112/e17222/expimp.htm - as this will provide several advantages as listed in the document.
Different Upgrade Methods For Upgrading Your Database (Doc ID 419550.1)
HTH
Srini

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