Re: ocfs2/oracleasm on Red Hat 4
- From: Jurijs Velikanovs <j.velikanovs@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 29 May 2009 01:29:47 +0300
> - guaranteed consistent disk naming across multiple nodes
> - no need to worry about a SAN admin changing something that screws up your
> disk ordering
> - Automatically setting permissions for the disk devices
Does anybody seen any performance difference using ASMLib comparing
with character block devices? I have seen some references that because
of some IO optimizations that Oracle introduces in ASMLib in some
configuration it might be slower then others available options.
It might be that someone analyzed ASMLib code
(http://oss.oracle.com/projects/oracleasm/) and could share his
conclusions?
NOTE: The ASMLib kernel driver is released under the GNU General
Public License (GPL)
Regards,
Yury
On Thu, May 28, 2009 at 6:00 PM, Matthew Zito <mzito@xxxxxxxxxxx> wrote:
> You don't technically *need* ASMlib for ASM environments, but it has some
> definite advantages:
>
> - guaranteed consistent disk naming across multiple nodes
> - no need to worry about a SAN admin changing something that screws up your
> disk ordering
> - Automatically setting permissions for the disk devices
>
> As far as the available version, you could try opening an SR with Oracle and
> asking them to compile the drivers for you - I had to do that once for a
> customer who had to run a custom RHEL kernel due to a driver bug that was
> discovered.
>
> Matt
>
> -----Original Message-----
> From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
> Behalf Of QuijadaReina, Julio C
> Sent: Thursday, May 28, 2009 8:36 AM
> To: Guillermo Alan Bort
> Cc: oracle-l@xxxxxxxxxxxxx
> Subject: RE: ocfs2/oracleasm on Red Hat 4
>
> Thanks Alan,
> What you say is interesting. We are a RAC shop and I have always used
> oracleasm tools to create/delete ASM disks for SAN shared storage before or
> after I use them for an ASM instance. Maybe it's just my ignorance, but is
> there another way to do that without oracleasm?
>
> I did check the links and the download files go as far as kernel
> 2.6.9-78.0.22. The kernel I was going to upgrade to was 2.6.9-89 but didn't
> see that one on the list. I will test this on a test RAC to see if the
> current ocfs2/o2cb level allows me to mount the crs disks after upgrading to
> a newer OS kernel.
>
> Thanks,
> Julio Quijada
>
>
> From: alanbort@xxxxxxxxx [mailto:alanbort@xxxxxxxxx] On Behalf Of Guillermo
> Alan Bort
> Sent: Tuesday, May 26, 2009 11:51 PM
> To: QuijadaReina, Julio C
> Cc: oracle-l@xxxxxxxxxxxxx
> Subject: Re: ocfs2/oracleasm on Red Hat 4
>
> oracleasm is not needed for RH4U1 and up, you simply install the RDBMS, patch
> to whaterver patchset you want, fire up dbca and create the ASM instance.
> Works as well for RAC.
>
> Also, check http://oss.oracle.com/osswiki/OCFS2/NewFeaturesList which has the
> documentation for OCFS2. and http://oss.oracle.com/projects/ocfs2/files/ for
> the download files. See that there are files for both RH4 and RH5.
>
> hth
> Alan Bort
> Oracle Certified Professional
>
> On Tue, May 26, 2009 at 1:19 PM, QuijadaReina, Julio C
> <QuijadJC@xxxxxxxxxxxxxxx> wrote:
> Hello All,
>
> I was doing some server updates and noticed that ocfs2 and oracleasm lib are
> not available for Linux kernels higher than 2.6.9-78.0.22. Does this imply
> that for newer kernel versions the user must compile them? or maybe the newer
> kernels don't need these apps to be updated? Anybody seen this out there?
>
> Thanks,
> Julio Quijada
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Jurijs
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