The best document for AIX and Oracle is this one: http://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71006d2e0a/bae31a51a00fa0018625721f00268dc4/$FILE/Oracle%20Architecture%20and%20Tuning%20on%20AIX%20%28v%201.31%29.pdf This document doesn't either explain it explicit why it shouldn't be used. Herald ten Dam htendam.wordpress.com ________________________________________ Van: oracle-l-bounce@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] namens Allen, Brandon [Brandon.Allen@xxxxxxxxxxx] Verzonden: donderdag 27 mei 2010 19:25 Aan: oracle-l@xxxxxxxxxxxxx Onderwerp: RE: AIX Concurrent I/O for Oracle archive logs Just an update for anyone following this thread - I received a response from Oracle in my SR and they said that the only reason they recommend not to put archive logs on a CIO file system is because that's what IBM recommends and they suggested I ask IBM for further explanation. They also referred me to the below presentation from IBM, which says on slide 18 "Archive Logs - Do not use DIO or CIO", but unfortunately again gives no explanation: http://www.ibm.com/developerworks/wikis/download/attachments/53871900/Oracle_on_AIX_WebinarFeb2007.pdf?version=2 So, now I'm going to open a ticket with IBM. More as I have it . . . Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it. -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l