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  • 1.  JFS2 & CIO

    Posted Fri July 25, 2008 04:19 PM

    Originally posted by: SystemAdmin


    If I have mounted my JFS2 filesystems with cio options and will JFS2 filesystem cache be used ? If so what operations will use it and what operation will not use filesystem cache?

    Thanks
    #AIX-Forum


  • 2.  Re: JFS2 & CIO

    Posted Fri July 25, 2008 08:59 PM

    Originally posted by: nagger


    If you mount with the CIO option then file I/O will NOT use the file system cache at all.
    The read and writes from your application will have to be on 4KB boundaries and and a multiple of 4KB in size. There data will be read/written straight from the disk in to the buffers inside your program.
    That is the whole point of Concurrent I/O (CIO).

    Hope this helps, Nigel
    #AIX-Forum


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