Async and Direct I/O On Solaris using VXFS

Hello,
 
How can i confirm that oracle will be doing Direct I/O and Asynchronous i/o 
with following options.
Database FILESYSTEMIO_OPTIONS is set to ALL which means to use,
setall - Enables both ASYNC and DIRECT IO
we are using VERITAS volume manager 5.0 with VXFS filesystems(We don't have QIO 
or ODM) and file system mount options are set as follows
mincache=direct and conovsync=direct
Will Oracle is going to use both direct i/o and asynchronous i/o with these 
file system options.
How can we ensure i am getting direct i/o and Async i/o ?
can we enable some trace or something just to ensure we are getting both?
 
Thanks
Raj                                       

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