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тАО08-16-2007 02:37 AM
тАО08-16-2007 02:37 AM
asynchronous I/O
specifically targeting the OS tasks that setup/breakdown the fuinctionality i.e. what an admin would do prior to a database/application using the asynch i/o OR undo after that DB/APP has concluded use of asynch I/o.
The history is simple, a DBA came to me indicating that the asynchronous I/O is causing issues and it needs to be 'turned off' (huh?!). I've been trying find anything to indicate the asynchtonous I/O's status or state.
thanks
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тАО08-16-2007 03:53 AM
тАО08-16-2007 03:53 AM
Re: asynchronous I/O
Oracle has this functionality compiled in it's Kernel. So, if DIRECT I/O can be enabled/disabled, is done at Oracle side.
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тАО08-16-2007 06:54 PM
тАО08-16-2007 06:54 PM
Re: asynchronous I/O
About HP-UX:
VxFS does not support Asynchronous I/O. Only raw devices support Async I/O (you should configure drivers for this facility), VxFS support Direct I/O with option OlineJFS (mount options mincache=direct and convosync=direct).
About Tru64:
AdvFS support both options Direct I/O and Asynchronous I/O automatically. I think it is possible to "turn off" some of this facility on Oracle level. But it is very strange if your DBA make decision turn off Async I/O (it cans degrade performance of Data Base).
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тАО08-16-2007 08:35 PM
тАО08-16-2007 08:35 PM
Re: asynchronous I/O
http://www.ixora.com.au/notes/fs_asynchronous_io.htm
I would really like to know what issues asynchronous I/O is causing.
Can you ask your DBA (since it is Oracle stuff)?
See also:
http://download-east.oracle.com/docs/html/A90347_02/appc_tru.htm
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тАО08-16-2007 09:18 PM
тАО08-16-2007 09:18 PM
Re: asynchronous I/O
http://homepage.mac.com/tikimac/papers/Oracle%20Filesystems.pdf
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тАО08-17-2007 05:26 AM
тАО08-17-2007 05:26 AM
Re: asynchronous I/O
thanks for the help.