RE: Extent size on RHEL 5 vs 6

  • From: "D Kenl" <dkenlwork@xxxxxxxxx>
  • To: "'oracle-l'" <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 13 Oct 2014 13:41:31 -0500

Ah, we will be using SAN – no local disks involved.




From: Waldirio Manhães Pinheiro [mailto:waldirio@xxxxxxxxx] 
Sent: Monday, October 13, 2014 1:13 PM
To: dkenlwork@xxxxxxxxx
Cc: oracle-l
Subject: Re: Extent size on RHEL 5 vs 6


Hello Deborah and List, good afternoon


I'm not sure if talking about only PE will be enough to your question, because 
you can use local disk or SAN for example.


BTW, you can see another good functionality when talking about RHEL6, tuned. 
With tuned you can set your server according " templates" or just create your 
personal configuration according your necessity.


Bellow a default sample:


[root@rhel01 abrt]# tuned-adm list

Available profiles:

- throughput-performance

- spindown-disk

- virtual-host

- default

- laptop-ac-powersave

- laptop-battery-powersave

- server-powersave

- virtual-guest

- desktop-powersave

- enterprise-storage

- latency-performance

Current active profile: default

[root@rhel01 abrt]#


and all related configuration are stored in /etc/tune-profiles


If you need some help, just reply!


Take Care

msn: waldirio@xxxxxxxxx
Skype: waldirio



On Mon, Oct 13, 2014 at 2:36 PM, D Kenl <dkenlwork@xxxxxxxxx> wrote:

We need to migrate our various Oracle servers (database, warehouse, web server) 
from RHEL 5 to 6, so have started testing.  One difference I noticed on the 
install is that RHEL 5 defaults the LVM physical extent size to 32 MB, while 
RHEL 6 defaults it to 4 MB.  With RHEL 5 I just went with the default size, but 
now that I see a different default for 6, I’m wondering if one is better than 
the other in terms of Oracle?  I did find some sites which mentioned that 
Oracle frequently requires a specific LVM extent size for better IO 
performance, but I can’t find anything specific in Oracle documentation, MOS, 
etc that refers to this.  Does anyone know what extent size is preferred for 
the various Oracle setups (database, warehouse, etc), or what documentation 
would at least specify this?  Or does it differ depending on your environment?  
TIA for any info!




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