Re: ASM and RAW Devices on RHEL 4

Hi Sanjay

I have a vmware installation in my laptop using OCFS2 for Voting Disk and OCR files (CentOS 4.2). Works ok.

Regarding persistence in raw devices, I have them listed in /etc/sysconfig/rawdevices and they seem to work fine. What I mean is after reboot, raw- qa returns the raw devices.

regards

LSC On 3/7/06, Sanjay Mishra <smishra_97_at_yahoo.com> wrote:
>
> Raj
>
> I think question is to use ASM with ASMLIB I/O API or ASM with Linux I/O
> API. In both cases, it is using RAW.
>
> OCR and Voting disk has to go in RAW devices as ASM is not meant for these
> files. We need OCR and Voting before ASM is started. I don't think that it
> is possible to store OCR/Voting disk on OCFS2. OCFS2 use differnt config
> files than OCFS and so Oracle installer cannot verify the cluster file
> location as it is trying to read from OCFS location. Even if you create
> symlink for OCFS and OCFS2 location , it will still not work as OCFS2
> configuration doesn't have any GUID information.
>
> I am catching on RAC and reading extensively and so this is just mine view
>
>
> thanks
> Sanjay
>
> *Raj S <sanstorage_at_gmail.com>* wrote:
>
> 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
> > >
> >
> >
>
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