Does anybody have experience with concurrent I/O on AIX 5.3 64-bit server? All documents that I have read state to set JFS2 block size to the database db_block_size. That would mean agblksize=db_block_size=16k for my database. Is that true? All documents that I have seen set agblksize=512. Also, redo logs, archive logs, and controlfiles should not be on JFS2 that are mounted with concurrent I/O. Is that true? thanks. _________________________________________________________________ Helping your favorite cause is as easy as instant messaging. You IM, we give. http://im.live.com/Messenger/IM/Home/?source=text_hotmail_join