The topic is Oracle 11g specific. If you do not get any response here I suggest to post this question in the Database General or PHP forum. You might want to review some of the information using the forum search function, searching for "drcp busy", for instance.
This thread has been moved to the PHP forum space.
It was originally posted to the Oracle Linux forum space.
It is not an operating system question.
With the almost complete lack of technical content in this post, I can only guess that you have configured very high values of servers and are seeing the “dedicated optimization” mentioned in the whitepaper http://www.oracle.com/technetwork/topics/php/php-scalability-ha-twp-128842.pdf If you share detailed information about your configuration, benchmark load and the DRCP V$ view contents, it would help.