Re: AIX concurrent I/O in database environments

From: Wilfrid Allembrand (wilfrid.allembrand_at_gmail.com)
Date: 07/13/05

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    Date: 13 Jul 2005 09:12:12 -0700

    Greetings,

    I also configured CIO on my P570 box, AIX 5.2 ML6, Oracle 9iR2. Nice
    improvements (about 20%).
    Also noticed that it's slow when restoring big files onto FS with CIO.

    Noticed too that you must be carefull with AIX patches : CIO and JFS2
    is not yet completly mature and you can get JFS2 FS corruption which,
    of course, can corrupt your datafiles (that's what I got so I had to
    apply a recent patch from mid june)...

    Just my 2 cents.
    Wilfrid

    aixdude@yahoo.com a écrit :
    > vlad.zam@gmail.com wrote:
    > > DIO doesn't work on jfs2, it's for jfs.
    >
    > Uh.... wrong. DIO works with JFS2. Did you read the article
    > via the link I provided? A good full 3 pages on how DIO works
    > with JFS2.
    >
    > In fact CIO is actually DIO with the Inode lock acquired in read-shared
    > mode for both reads and writes.
    >
    > JFS2 uses a read-shared, write-exclusive inode lock, so when a write
    > occurs, the file system is locked for both reads and writes.
    >
    > Under CIO the inode lock is acquired in read-shared mode for both read
    > and write access, in most cases.

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