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: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Raj S
Sent: Tuesday, March 07, 2006 2:16 PM
To: exriscer_at_gmail.com
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.

Raj

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

Hi

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.

Cheers

LSC On 3/7/06, johan Eriksson < <mailto:johan.eriksson_at_bossmedia.se> johan.eriksson_at_bossmedia.se> 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 http://www.linuxjournal.com/article/8539

> 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)

/johan

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