Re: ASM and RAW Devices on RHEL 4

From: Tanel Põder <tanel.poder.003_at_mail.ee>
Date: Tue, 7 Mar 2006 13:43:58 -0600
Message-ID: <004201c6421f$7a7d4fd0$9a0110ac@porgand>

Hi,

Put 'em into /etc/sysconfig/rawdevices

Tanel.

Original Message ----- From: Bob Murching To: sanstorage_at_gmail.com ; exriscer_at_gmail.com Cc: 'johan Eriksson' ; 'Oracle-L Freelists' Sent: Tuesday, March 07, 2006 1:24 PM 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: 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 < 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

--
http://www.freelists.org/webpage/oracle-l

Received on Tue Mar 07 2006 - 13:43:58 CST