Re: ASM and RAW Devices on RHEL 4

Hi,

Put 'em into /etc/sysconfig/rawdevices

Tanel.
  ----- Original Message ----- 
  From: Bob Murching 
  To: sanstorage@xxxxxxxxx ; exriscer@xxxxxxxxx 
  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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Raj S
  Sent: Tuesday, March 07, 2006 2:16 PM
  To: exriscer@xxxxxxxxx
  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@xxxxxxxxx> 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@xxxxxxxxxxxx> 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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