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Solaris Very Direct IO [message #366265]

Fri, 12 December 2008 08:06

claytech
Messages: 9
Registered: December 2008
Location: UK

Junior Member

Can anyone tell from the following truss output if I am using Direct IO. I have conflicting statements, one says I AM using Direct IO as the 3rd parm of ioctl is not zero and the other says that I AM NOT using Direct IO as the file is not opened with the O_DIRECT flag.

3085/1: open("/oradata/rbssys/users01.dbf", O_RDWR|O_DSYNC) = 11
3085/1@1: -> libc:directio(0x103, 0x1, 0xfffffffe7a1cea98, 0x746571fefefefeff)
3085/1: ioctl(259, _ION('f', 76, 0), 0x00000001) = 0
3085/1@1: <- libc:directio() = 0

Help much appreciated.

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Re: Solaris Very Direct IO [message #366273 is a reply to message #366265]

Fri, 12 December 2008 09:50

ebrian
Messages: 2794
Registered: April 2006

Senior Member

From that output you are using Direct I/O. The O_DSYNC is expected with Oracle on Solaris.

A very helpful article to review is Demystifying Oracle IO.

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Re: Solaris Very Direct IO [message #366274 is a reply to message #366273]

Fri, 12 December 2008 09:52

claytech
Messages: 9
Registered: December 2008
Location: UK

Junior Member

Thanks!!

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