RE: RAC nodes

From: Reardon, Bruce (CALBBAY) <Bruce.Reardon_at_comalco.riotinto.com.au>
Date: Fri, 16 Jul 2004 09:48:29 +1000
Message-ID: <DF33C5D0C428FE4DBC8410FC2793EE7F0141BB06@calbbsv025.cal.riotinto.org>

The HP web site mentions VMS clusters at up to 500 miles = (http://h71000.www7.hp.com/openvms/products/clusters/index.html and = http://h71000.www7.hp.com/openvms/products/clusters/clusters.pdf) I'm sure they have case studies but I can't find any quickly - perhaps = talk with HP.

We have a VMS cluster (ie shared disks) over ~1 km with 2 nodes at each = site connected by FC.
The disks are HW mirrored at each site and VMS volume shadowed (ie = software) between sites
Though this is with Rdb rather than Oracle RAC.

HTH,
Bruce Reardon

-----Original Message-----
Sent: Friday, 16 July 2004 3:32 AM
Carol,

One of the biggest challenges you are going to have is, as someone else mentioned, sharing disk over the large geographical location. Last I = spoke
with an Oracle rep, this had only been done over a short distance - like = a
couple of hundred yards. Seems unbelievable to me that this *can't* be done, but it's what I've been told.

So someone in your organization needs to solve that problem first. If = it
does not exist, then you are stuck with either replication, or one = database
server shared by all.

Tom Mercadante
-----Original Message-----
From: Carol Legros [mailto:clegros_at_orsis.ca]=20 Sent: Thursday, July 15, 2004 2:24 PM

Raj,
I recently spoke with someone that is considering putting in RAC in this =

configuration.
We don't know of anyone that *has* done this, and on the flip side, we=20 couldn't think of any other
reasons this solution might be problematic except for the network.

I'd like to hear about similar RAC experiences (servers split over=20 geographic locations)
from others on the list if they have tried it. =20

Carol

Raj Jamadagni wrote:
>Other than network latency and other outages, what more do you _want_=20
>Raj
>--- Carol Legros <clegros_at_orsis.ca> wrote:
>>I'm wondering if anyone out there that is using RAC has set up their=20
>>nodes such that half of the nodes reside in one geographic location=20
>>and the other half of their nodes in another geographic location (ie=20
>>100 miles away).
>>
>>I can envision possible issues with network latency or outages, but=20
>>I'm wondering what other problems/issues others may have found if/when =
they tried such a configuration.
>>
>>Cheers
>>Carol

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Received on Thu Jul 15 2004 - 18:45:10 CDT