error while loading shared libraries: libaio.so.1: cannot open shared object file

While wanting to preform a disaster recovery using RMAN on a spare server which has an ORACLE_HOME 10.2.0.1 64bits installed on a Red Hat Enterprise Linux AS release 4 Operating System.
I tried the following to read back my controlfile. But before getting to this point i faced this error :

oracle@xxx: $ $ORACLE_HOME/bin/rman target /

Recovery Manager: Release 10.2.0.1.0 – Production on Wed Jul 8 10:32:56 2009

Copyright (c) 1982, 2005, Oracle. All rights reserved.

oraclewiki: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04005: error from target database:
ORA-12547: TNS:lost contact

Assuming the libaio library was installed i searched and tried to clear this up. As the server is a x86_64 server there should be a 64 bit library of libaio installed :

oracle@xxx: # find / -name libaio.so.1
/local/app/oracle/product/db10g/lib/stubs/libaio.so.1
/local/app/oracle/product/agent10g/lib/stubs/libaio.so.1
/local/app/oracle/product/db10gtest/lib/stubs/libaio.so.1
/local/app/oracle/product/10.2.0/db/lib/stubs/libaio.so.1
/local/app/oracle/product/10.2.0/db/lib32/stubs/libaio.so.1
/usr/lib/libaio.so.1

oracle@xxx: $ ldd $ORACLE_HOME/bin/oracle | grep libaio
libaio.so.1 => not found

As i could see here, this was not the case. Only the 32 bit is availible and therefor not used by the Oracle 64 bits Database software.
The output of the ldd command supports this as there is a dependency problem for the oracle process on libaio.so.1.

After adding the following rpm’s i was able to connect without problems.

root@xxx: # up2date –showall | grep libaio | grep 64
libaio-0.3.105-2.x86_64
libaio-devel-0.3.105-2.x86_64

As you can see now the correct library is found and the dependency problem is solved.

oracle@xxx: $ ldd $ORACLE_HOME/bin/oracle | grep libaio
libaio.so.1 => /usr/lib64/libaio.so.1 (0x0000002a96f40000)