Monitor I/O on Suse Linux

Hello

I have a Suse Linux system with many applications running.
Sometimes the
system slows down because of heavy disk I/O (I can see it in
top in  the
summ up line: wa waiting for I/O)
Is there a way to  break down this total between the list of
process who
are in this state ?
 
Thanks

-- 
Emmanuel Kasprzyk
System Administrator
Cocoon Technologies - Discover the power of competencies
Firmenbuchnummer: 214321d - Zuständiges Gericht:
Handelsgericht Wien


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Not that I know of.

I usually run 'iostat -kx 3' to see which device is busiest.
 Then I use lsof to find out which processes have open files
on that device.  

Not foolproof, though.  So if anyone has a better way,
please let us know.

Kind regards,

Herta

-----Original Message-----
From: Emmanuel Kaspryzk [mailto:emmanuel.kasprzykcocoontecs.com] 
Sent: Wednesday, May 23, 2007 12:04
To: Linux-Oracle
Subject: [suse-oracle] Monitor I/O on Suse Linux 


Hello

I have a Suse Linux system with many applications running.
Sometimes the system slows down because of heavy disk I/O (I
can see it in top in  the summ up line: wa waiting for I/O)
Is there a way to  break down this total between the list of
process who are in this state ?
 
Thanks

-- 
Emmanuel Kasprzyk
System Administrator
Cocoon Technologies - Discover the power of competencies
Firmenbuchnummer: 214321d - Zuständiges Gericht:
Handelsgericht Wien


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Yuri Ivanov schrieb:
> USe Force, Emmanuel!
>   
Well I am still a young padawan so I cannot count that much
on it.

> Try to run 
> 'top'
> programm, to see, what process in 'D' state.
> or use 'ps' for same reason.
>   
Ok top with i interactive command, show me the only process
which are in
D ( uninterruptible state, which is usually I/O as says 'man
ps' ) or R
running state, this is already nice.
Thanks

A nice to have of cource would be to a break up of this I/O
consumption
in pourcentage, with possibility to renice it a la CPU time
( so I can
say  lower this updatedb priority or rug refresh stuff which
is bringing
down Skype on its knees ) but I am asking too much I think.

Manu

> On 12:03 Wed 23 May     , Emmanuel Kaspryzk wrote:
>   
>> Hello
>>
>> I have a Suse Linux system with many applications
running. Sometimes the
>> system slows down because of heavy disk I/O (I can
see it in top in  the
>> summ up line: wa waiting for I/O)
>> Is there a way to  break down this total between
the list of process who
>> are in this state ?
>>  
>> Thanks
>>
>> -- 
>> Emmanuel Kasprzyk
>> System Administrator
>> Cocoon Technologies - Discover the power of
competencies
>> Firmenbuchnummer: 214321d - Zust?ndiges Gericht:
Handelsgericht Wien
>>
>>
>> -- 
>> To unsubscribe, email: suse-oracle-unsubscribesuse.com
>> For additional commands, email:
suse-oracle-helpsuse.com
>> Please see http://www.suse.com/oracl
e/ before posting
>>
>>     
>
>   


-- 
Emmanuel Kasprzyk
System Administrator
Cocoon Technologies - Discover the power of competencies
Firmenbuchnummer: 214321d - Zuständiges Gericht:
Handelsgericht Wien


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Hi, recently we migrated from IBM xSeries 445 Suse SLES 9
(32 bits) with 9 
GB RAM to HP DL580 G4 SLES9 (AMD64/EM64T) with 16 GB RAM, in
both cases 
attached to a external FC storage (Hitachi AMS500) running
SAP 4.7 on 
Oracle 9.2.0.7.

In boths cases we use ext3 filesystems mounted with the
writeback option.

After migration we don't see visible better performance and
I suspect some 
of the hardware components (HBA or ethernet cards) is
responsible for the 
unexpected performance.


The question is, anyone have the same servers or
configuration and have 
some tip to help us improve performance?

Thanks!

Herman Maseberg
Analista Sr. de Tecnología
Loma Negra C.I.A.S.A.
Bouchard 680 - Torre Fortabat - Buenos Aires
Tel: (54-11)4319-3000 int. 3249
herman.maseberglomanegra.com.ar

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Hi Herman,

We changed from HP DL 580 G3 to G4. Former CPU was XEON 3,66
GHz, now CoreDuo2 3,00 GHz. We changed only to
have more parallel CPU-Power with more cores. 

So you should a have a closer look on what you want to
achieve with this switch to the new machine. We have
a high load always at the same times a day. Up to 50 running
Processes at the same time. With only 4 CPU's a
lot had to be queued. Now we have 4 DualCore = 8 CPU and HT
for each Core makes 16 usable CPU's and the
highload times are gone.

The new CPU's seem to be exactly as fast as the old 3,66
ones. If you need more speed for only one process,
you can either try to get a 30 GHz-CPU ( which ist still not
available )  ) - or
try to get your SQL's
running by using the "parallel-option". 

Last but not least: Performance normally is not that easy to
improve. Try to find out what statspackreport
tell you to do or jump in the database and find miserably
executed SQL's. Perhaps you can help your
optimizer with some new/changed indexes. 
Till then analyze all Indexes and tables - could be done
online when productiontime is not that heavy.....

Greetz
Ralf

Ralf Dieterle
-----------------------------------
Leitung KIS Systembetreuung
-----------------------------------
Vinzenz von Paul Kliniken gGmbH
Marienhospital Stuttgart
EDV
Böheimstr. 37
D - 70199 Stuttgart
-----------------------------------
Phone: (++49) (0) 711/6489-2974 
FAX    :  (++49) (0) 711/6489-2985
mailto: RalfDieterlevinzenz.de 
web: http://www.vinzenz.de/
-----------------------------------
Sitz: Stuttgart
Amtsgericht Stuttgart, HRB 18126
Geschäftsführer: Dipl.-Volkswirtin Monika Röther,
Dipl.-Betriebswirt (FH) Friedrich Heinzmann
-----------------------------------


>>> <Herman.Maseberglomanegra.com.ar>
28.05.2007 21:25 >>>
Hi, recently we migrated from IBM xSeries 445 Suse SLES 9
(32 bits) with 9 
GB RAM to HP DL580 G4 SLES9 (AMD64/EM64T) with 16 GB RAM, in
both cases 
attached to a external FC storage (Hitachi AMS500) running
SAP 4.7 on 
Oracle 9.2.0.7.

In boths cases we use ext3 filesystems mounted with the
writeback option.

After migration we don't see visible better performance and
I suspect some 
of the hardware components (HBA or ethernet cards) is
responsible for the 
unexpected performance.


The question is, anyone have the same servers or
configuration and have 
some tip to help us improve performance?

Thanks!

Herman Maseberg
Analista Sr. de Tecnología
Loma Negra C.I.A.S.A.
Bouchard 680 - Torre Fortabat - Buenos Aires
Tel: (54-11)4319-3000 int. 3249
herman.maseberglomanegra.com.ar 

.........................................................
Este mensaje, incluyendo sus anexos, contiene informaciones
confidenciales 
destinadas al individuo y propósito específicos, y está
protegido por ley. 
Caso no sea el usuario a quien está dirigido, debe borrar
este mensaje. 
Está terminantemente prohibida la utilización, el acceso,
copia o 
divulgación no autorizada de las informaciones presentes en
este mensaje. 
Las informaciones contenidas en este mensaje y en sus anexos
son de 
responsabilidad de su autor, no representando ideas,
opiniones, 
pensamientos o cualquier forma de posicionamiento por parte
del Grupo Loma 
Negra.

Esta mensagem, incluindo os seus anexos, contém informações
confidenciais 
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protegida por lei. 
Caso você não seja o citado indivíduo, deve apagar esta
mensagem. 
É terminantemente proibida a utilização, acesso, cópia ou
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As informações contidas nesta mensagem e em seus anexos são
de 
responsabilidade de seu autor, não representando idéias,
opiniões, 
pensamentos ou qualquer forma de posicionamento por parte do
Grupo Loma 
Negra. 

The information contained in this communication is
confidential, is law 
protected, and is intended only for business use of the
addressee. If you 
have received this communication in error, please
immediately delete it. 
It's forbidden the unathorized use, access, copy or disclose
of the 
information contained in this communication. 
The content of this message is responsability of the author,
and does not 
represent ideas, opinions, thoughts or any kind of statement
of Loma Negra 
Corporation.

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