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Re: ASM and RAW Devices on RHEL 4

From: LiShan Cheng <exriscer_at_gmail.com>
Date: Tue, 7 Mar 2006 21:19:05 +0100
Message-ID: <6e9345580603071219u409286e5m4f8b2ea34e31ce16@mail.gmail.com>


My doubt is really, is ASMLib I/O API better than Linux I/O API? :-)

On 3/7/06, LiShan Cheng <exriscer_at_gmail.com> wrote:
>
> 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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>

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Received on Tue Mar 07 2006 - 14:19:05 CST

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