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13 Jan 12 - MC Press online - Informix Dynamic Server Entices New Users with Free Production Edition ... Read
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1 Aug 11 - IBM Data Management Magazine - IIUG user view: Happy 10th anniversary to IBM and Informix... Read
8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
31 May 11 - Smart Grid - The meter data management pitfall utilities are overlooking... Read
27 May 11 - IBM Data Management Magazine - IIUG user view: Big data, big time ( Series data, warehouse acceleration, and 4GLs )... Read
16 May 11 - Business Wire - HiT Software Announces DBMoto for Enterprise Integration, Adds Informix. Log-based Change Data Capture... Read
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10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read

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IDS Forum

RE: onstat -g rea almot 100 queue there !!!

Posted By: Penza Kenneth at MITTS
Date: Friday, 11 July 2008, at 7:36 a.m.

In Response To: Re: onstat -g rea almot 100 queue there !!! (Art Kagel)

We are using kaio on RHEL3, you need to have the libaio rpm
installed on your machine. The Informix chunks must be bound using the
raw utility, as follows.

$ cat /etc/sysconfig/rawdevices
# raw device bindings
# format: <rawdev> <major> <minor>
# <rawdev> <blockdev>
# example: /dev/raw/raw1 /dev/sda1
# /dev/raw/raw2 8 5
/dev/raw/raw1 /dev/sdc1
/dev/raw/raw2 /dev/sdc2

Then as root execute /etc/init.d/rawdevices restart to bind the new
devices and give the Informix user the permissions on the devices
chown informix:informix /dev/raw/raw[12] (devices as in example above).
Use /dev/raw/raw1 or links that point to these devices in the Informix
configuration. The KAIOON variable controls the number of requests
allocated to each CPU VP thus it should be set to around 10000, if need
be tune /proc/sys/fs/aio-max-nr.

Kenneth Penza

-----Original Message-----
From: [] On Behalf Of
Art Kagel
Sent: 10 July 2008 17:01
Subject: Re: onstat -g rea almot 100 queue there !!! [12629]

AHH! RH3 did not support O_DIRECT may not have supported KAIO (Kernel
Asynchronous IO) or even REAL RAW devices (Linus was against RAW device
support for a LOOOONG time, even now he's trying to get rid of RAW now
O_DIRECT is almost as good for databases. That may be your problem.
that out on the RH support groups, I'm no RH expert.


On Thu, Jul 10, 2008 at 4:07 AM, MARS CHEN <> wrote:

> >Yes, you've got it. You are correct, your chunks certainly do look
> >they are RAW and so KAIO should be working for you, but, as I said,
> >not. Your onstat -g iov output does not show any kio threads running.
> >is on by default on all platforms except HPUX (because HPUX doesn't
> >with KAIO installed, it's a separate package). However, check out the

> >engine startup script, the environment variable KAIOOFF can be used
> >disable KAIO, maybe someone put it in ther by mistake. Also, no IDS
> >does not have O_DIRECT support, it's in 10.00 and later and the most
> recent
> >releases of 9.40.
> Thanks for your kind response ~~
> I set KAIOON=1 , and then oninit immediately , the result of onstat -g
> still showes aio , not kaio ....
> Maybe I forget to config something for IDS 7.31 or RedHat Enterprise
> 3,
> the kernel or else ~~
> Forum Note: Use "Reply" to post a response in the discussion forum.

Art S. Kagel
Oninit (
IIUG Board of Directors (

Disclaimer: Please keep in mind that my own opinions are my own opinions
do not reflect on my employer, Oninit, the IIUG, nor any other
with which I am associated either explicitly or implicitly. Neither do
opinions reflect those of other individuals affiliated with any entity
which I am affiliated nor those of the entities themselves.

Forum Note: Use "Reply" to post a response in the discussion forum.

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