Re: ASM and RAW Devices on RHEL 4
- From: "LiShan Cheng" <exriscer@xxxxxxxxx>
- To: "johan Eriksson" <johan.eriksson@xxxxxxxxxxxx>
- Date: Tue, 7 Mar 2006 11:39:20 +0100
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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