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IDS Forum

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

Posted By: Art Kagel
Date: Thursday, 10 July 2008, at 3:44 a.m.

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

Yes, you've got it. You are correct, your chunks certainly do look like
they are RAW and so KAIO should be working for you, but, as I said, it's
not. Your onstat -g iov output does not show any kio threads running. KAIO
is on by default on all platforms except HPUX (because HPUX doesn't come
with KAIO installed, it's a separate package). However, check out the
engine startup script, the environment variable KAIOOFF can be used to
disable KAIO, maybe someone put it in ther by mistake. Also, no IDS 7.31
does not have O_DIRECT support, it's in 10.00 and later and the most recent
releases of 9.40.

Art

On Thu, Jul 10, 2008 at 2:28 AM, MARS CHEN <mars@jsun.com> wrote:

> Dear Art Kagel ...
>
> Thanks for your kind response ~~
>
> My case is the IDS restart every 24 hours , the very busy is about 5 hours
> ,
> and not very busy is 3 hours , and 16 hours without any sessions ,
> so I'll try to onstat -z at tomorrow morning just before rush hours to come
> ,
> to figure out the correct number from onstat -p ...
>
> Meanwhile , I think I use the raw device , I check :
> #cat /etc/sysconfig/rawdevices
>
> /dev/raw/raw1 /dev/sda11
> /dev/raw/raw2 /dev/sda12
> /dev/raw/raw3 /dev/sda13
> /dev/raw/raw4 /dev/sda14
> /dev/raw/raw5 /dev/sda15
>
> and fdisk /dev/sda , I create those partiton :
>
> /dev/sda11 6374 6628 2048256 83 Linux
> /dev/sda12 6629 6883 2048256 83 Linux
> /dev/sda13 6884 7138 2048256 83 Linux
> /dev/sda14 7139 7393 2048256 83 Linux
> /dev/sda15 7394 7648 2048256 83 Linux
>
> and symbolic link to /dev/raw :
> # ls -l /opt/informix
>
> lrwxrwxrwx 1 informix informix 13 Sep 2 2005 raw1 -> /dev/raw/raw1
> lrwxrwxrwx 1 informix informix 13 Sep 2 2005 raw2 -> /dev/raw/raw2
> lrwxrwxrwx 1 informix informix 13 Sep 2 2005 raw3 -> /dev/raw/raw3
> lrwxrwxrwx 1 informix informix 13 Sep 2 2005 raw4 -> /dev/raw/raw4
> lrwxrwxrwx 1 informix informix 13 Sep 2 2005 raw5 -> /dev/raw/raw5
>
> ls -l /dev/raw/raw1
> crw-rw---- 1 informix informix 162, 1 Jun 25 2004 /dev/raw/raw1
> [root@linux06 root]# ls -l /dev/raw/raw2
> crw-rw---- 1 informix informix 162, 2 Jun 25 2004 /dev/raw/raw2
> [root@linux06 root]# ls -l /dev/raw/raw3
> crw-rw---- 1 informix informix 162, 3 Jun 25 2004 /dev/raw/raw3
> [root@linux06 root]# ls -l /dev/raw/raw4
> crw-rw---- 1 informix informix 162, 4 Jun 25 2004 /dev/raw/raw4
> [root@linux06 root]# ls -l /dev/raw/raw5
> crw-rw---- 1 informix informix 162, 5 Jun 25 2004 /dev/raw/raw5
>
> as preceeding showes , I think I use raw devices , but I don't know
> how to enable KAIO , it is in a RedHat Enterprise Linux 3.x OS ,
> If I am sure that chunk are all raw devices , still I should set
> DIRECT_IO 1 in onconfig ?!... it works at 7.31 ?!
>
> I used to think , onstat -g rea has threads queue over there ,
> it must be the cpu power not enough , but as your information ,
> It can be something else like I/O , Buffers,.... ,
> not just easily thinking it should be the cpu vps issue ,
> so my concept is wrong !!.... if your cpus are very powerful , very fast ,
> but if you have a very slow I/O , or you have a very small Buffers ,
> it will still cause the onstat -g rea queue a lot of threads ,
> and make OS cpu idle also ... I think that what you want to tell me~
>
> Thanks again for your kind help ~
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Art S. Kagel
Oninit (www.oninit.com)
IIUG Board of Directors (art@iiug.org)

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

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