Re: RAC environment patching and availability
- From: "Li Li" <litanli@xxxxxxxxx>
- To: "K Gopalakrishnan" <kaygopal@xxxxxxxxx>
- Date: Mon, 10 Sep 2007 13:23:57 -0500
Thanks Gopal, your information is very helpful!
On 9/10/07, K Gopalakrishnan <kaygopal@xxxxxxxxx> wrote:
>
> Li Li,
> In current versions, JUST RAC alone can not provide the 24x7
> availability. You need to have the combination of RAC+Dataguard (logical) to
> have REAL 24x7 availability. Also not all patches/upgrades are 'rolling
> upgrade' capable.
> Have a look at this presentation to undertand the issues in rolling
> upgrade.
>
> http://www.oracle.com/technology/deploy/availability/pdf/oow06/S281209_To.pdf
>
> -Gopal
>
> On 9/10/07, Li Li <litanli@xxxxxxxxx> wrote:
> > Hi, All,
> >
> > I recently patched our 2-node RAC (10.2.0.2 on RHEL AS 4 update 4) to
> > 10.2.0.3. I got the impression that you can do rolling upgrade in a RAC
> > environment, until I dig into the patch installation document and found
> out
> > that you can do rolling upgrade on the clusterware part but not on the
> RAC
> > database part. Fortunately we can afford the service to be down for a
> couple
> > of hours.
> >
> > My question is: is there a way to keep your RAC database up while you
> patch
> > it? RAC itself doesn't really provide 24x7 High Availability? Any
> comments?
> >
> > Thanks,
> > -Li
>
> --
> Best Regards,
> K Gopalakrishnan
> Co-Author: Oracle Wait Interface, Oracle Press 2004
> http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/
> Author: Oracle Database 10g RAC Handbook, Oracle Press 2006
> http://www.amazon.com/gp/product/007146509X/
>
>
>
>
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