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  • 1.  Enabling CIO in AIX

    Posted Wed November 10, 2010 12:35 AM

    Originally posted by: manu12


    Hi,

    I would like to know how to enable Concurrent IO in AIX 5.3?also after enabling how to check whether it is CIO enabled?

    Any disadvantages after enabling

    Regards

    Manu


  • 2.  Re: Enabling CIO in AIX

    Posted Wed November 10, 2010 07:11 AM

    Originally posted by: unixgrl


    It's just an option on the mount command. Read the manpage for mount and then make sure you know how your app will use it. You can see if its enabled by running "mount".


  • 3.  Re: Enabling CIO in AIX

    Posted Wed November 10, 2010 11:46 AM

    Originally posted by: j.gann


    In fact, cio is enabled by specifying a flag (O_CIO) when your user process is open()ing a file which it wants to access with cio semantics.

    Because app vendors need to rewrite and rebuild their programs to make use of this, ibm has wisely supplied the named "cio" mount option which will make all open()s to files in the respective filesystem be done with an implied O_CIO flag.

    for benefits and caveats read "Improving Database Performance With AIX Concurrent I/O"

    j.gann


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