Re: Tweaking the crs
- From: Alexander Gorbachev <gorbyx@xxxxxxxxx>
- To: arunrao_oradba@xxxxxxxxxxx
- Date: Thu, 24 Feb 2005 21:08:41 +0100
Arun,
CRS doesn't support IO fencing - this is Veritas stuff. 10g RAC has
some ideas of voting disks but it has nothing to do with IO fencing
through SCSI-3 reservations.
If you are running CRS on top of other clusterware (perhaps, Veritas
as you mentioned IO-fencing) than third party clusterware should
normally detect split brain first and signal to Oracle instance.
Split-brain situation is when you have both nodes still running but
they lost interconnect/heartbeat. In this case one of them has to take
ownership of the cluster. In Veritas, it can be through IO-fencing
when the winning node kicks out the looser.
If you are running 10g + HP-UX + Veritas - please drop me a mail
privately... We were asking Oracle to provide a reference customer
with this configuration and it seems there is no one yet.
As far as our understanding is correct, CRS should be able to work
without any clusterware. However, it seems that on HP-UX (PA-RISC at
least) it can't do it because this implementation of CRS is lacking
host membership mechanism - it handles only "instance-membership". Is
it's true, we'll get confirmation very soon.
Cheers,
Alex
On Wed, 23 Feb 2005 18:55:25 +0000 (GMT), arun chakrapani rao
<arunrao_oradba@xxxxxxxxxxx> wrote:
> Sorry for the confusion Rac Gurus
> I was refering to the split brain in rac env
> I was not able to get a clear doc on io fencing which
> the crs take care of.
> Hence thought one of you would be having this doc out
> with you
> But any way thanks for the doc which u people pointed
> out
> Thanks again
> Arun
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