aio on sun ufs problem

From: zhu chao <chao_ping_at_vip.163.com>
Date: Tue, 4 May 2004 17:59:45 +0800
Message-ID: <003901c431be$887f2e00$2552fc0a@corp.ebay.com>

Hi friends:

    While reading the following paper: http://de.sun.com/Partner/Softwarepartner/Oracle/Technik/pdf/oracle_on_sun.pdf     It says for oracle 8.1.7/ufs, aio is by default disabled. We must enable it explictly with _filesystemio_options=asynch. Is it true? For aio on raw device/QuickIO, we can see truss -t kaio -p dbwr to verify it, for aio on filesystem, how to verify it then?     And other question about solaris, that doc also says, with solaris 8 update 3, there is concurrent directIO for ufs. Is it a feature of ufs, or a feature of solaris kernel? If it is a ufs feature, then even with solaris 8 update 3, I cannot use this feature on vxfs/solaris8 update 3.If it is a feature of solaris kernel, I think CDIO is also ok on vxfs, is it true?     And how can I know whether my solaris 8 is using update 3+ via command line like compare the kernel version (uname -a)?

Thanks.
zhu chao.

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Received on Tue May 04 2004 - 04:56:45 CDT