Re: raw devices in linux (O

Re: raw devices in linux (O_DIRECT)

This is a discussion on Re: raw devices in linux (O_DIRECT) within the Informix forums, part of the Database Server Software category; --> Martin Fuerderer escribió: > Hi, > > in your Machine Specific Notes you should see something like this: > ...

		Unix Technical Forum > Database Server Software > Informix
Re: raw devices in linux (O_DIRECT)

#1 (permalink)

04-20-2008, 07:50 AM

Fernando Ortiz

Posts: n/a

Re: raw devices in linux (O_DIRECT)

Martin Fuerderer escribió:
> Hi,
>
> in your Machine Specific Notes you should see something like this:
>
> -------------------------------------------------------
> 3. Kernel Asynchronous I/O (KAIO)
>
> Asynchronous I/O is supported by the official Linux kernel since
> version
> 2.6.x. IBM Informix Dynamic Server supports Kernel Asynchronous I/O
> (KAIO)
> on character devices (a.k.a. raw devices) and block devices. It is
^^^^

> enabled
> by default, and can be disabled by setting the environment variable
> KAIOOFF=1 in the environment of the process that brings up the server.
>
> ...
>
> Note that the libaio.so library is required, regardless of the
> distribution
> or kernel level. At the time of writing, IBM Informix Dynamic Server
> requires a minimum of libaio 0.3.96-3.
> -------------------------------------------------------
>
> Where the last paragraph is exactly what Sandor has pasted into the
> e-mail before.
>
> Which information do you think is missing ? Can you be more specific ?
>

I's been using IDS on linux for years and always need to link the disk partitions (block
devices) to raw devices (/dev/raw) to optimize I/O.

It wasn't clear to me, that I don't need any longer to use /dev/raw, and can just use the
block device.

Theere's also no reference to O_DIRECT in the release/en_us/0333/* files nor the
Information Center site (http://publib.boulder.ibm.com/infoce...help/index.jsp)

----

Thanks everyone wich help me undertand how KAIO works now in kernel 2.6 and IDS 10.

IDS 10.0UC1 working fine in Fedora Core 3

Regards,

sending to informix-list

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