Re: ASM and RAW Devices on RHEL 4
- From: "Raj S" <sanstorage@xxxxxxxxx>
- To: exriscer@xxxxxxxxx
- Date: Tue, 7 Mar 2006 13:15:48 -0600
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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