Extensive IO after Configuring DB Streams Replication

Hi all,
 
I'm learning on configuring and managing Oracle Streams Replication.
 
I managed to configure a bidirectional Database replication using the PRE_INSTANTIATION_SETUP and POST_INSTANTIATION_SETUP procedures in the DBMS_STREAMS_ADM package between two databases (DB1 and DB2). I used RMAN DUPLICATE command for instantiation.
 
Here is my question:
 
Once the configuration is finished, I noticed an extensive IO activities on the hardisks in both DB1 and DB2, although there were no DML or DDL against any of the databases by users. Is that normal in Oracle Streams environment? What is the reason of it? May be it is this way only in the first few hours of finishing this configuration and eventually the IO will become stable.
 
Oracle 10g R2 on Windows XP SP2

Could be the writing of data dictionary to redo logs on target and the mining of it on the source.
Did it stop after a while?

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hi porzer,
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Edit
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Hi Basu,
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Thanks a lotz Anurag..
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Extensive IO after Configuring DB Streams Replication

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