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RE: ASM and RAW Devices on RHEL 4

From: Bryan Thomas <>
Date: Tue, 7 Mar 2006 13:32:55 -0600
Message-Id: <>

Hey Bob,  

There is no persistence with RHEL 4.0 raw devices. You must script something to execute the raw devices each time.  

This is SOP for RHEL 4.0.  

Of course you may not to take my word since I helped with the install;)  



From: [] On Behalf Of Bob Murching
Sent: Tuesday, March 07, 2006 1:25 PM
To:; Cc: 'johan Eriksson'; 'Oracle-L Freelists' Subject: RE: ASM and RAW Devices on RHEL 4  

Does anyone have a problem with raw devices disappearing upon reboot in RedHat AS4 QU2 (x86-64)? We find that we have to recreate them on boot via rc scripts and trust that this is not standard operating procedure?!  

From: [] On Behalf Of Raj S
Sent: Tuesday, March 07, 2006 2:16 PM
Cc: johan Eriksson; Oracle-L Freelists
Subject: Re: ASM and RAW Devices on RHEL 4

There are no issues using rawdevices for ocr.dbf and votingdisk. They work just fine. Put them in your /etc/sysconfig/rawdevices and create the necessary mapping to the shared storage. We have several of these running fine on raw devices with 10G R2 on RHEL4.


On 3/7/06, LiShan Cheng <> wrote:


That test is comparing LVM + EXT3 vs ASM + RAW. My comparison would be ASM + RAW + LINUX I/O API vs ASM + RAW + ASMLIB I/O API.

I am not sure if ASMLib is better or ASM and RAW is enough.


LSC On 3/7/06, johan Eriksson < <> > wrote:

On Tue, 2006-03-07 at 10:54 +0100, LiShan Cheng wrote:
> Hi
> I am going to install a 10gR2 RAC in a couple of weeks. It will be
> RHEL 4 Update 2 and I will be using ASM for all database files.
> However I have some doubts, I am wondering if ASMLib API gives better
> performance than Linux standard I/O API? Anyone with both ASMLib
> experience and ASM + RAW + Linux I/O API?

We have just installed this combination but I haven't tested the performance yet.
One test is at

> I also read this note, Note: 357492.1, Linux 2.6 kernel deprecation of
> raw devices. I was planning to use RAW Devices for the voting disk and
> OCR files. If raw devices are deprecated does it mean I must use
> OCFS2?

Linux 2.6 and OCFS2 aren't yet cerified so I think you have to use raw for ocr and voting (if you care about support)


Received on Tue Mar 07 2006 - 13:32:55 CST

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