|
Hrrrmm
- well, we've never seen the problem you describe, and we've got a pretty big
RAC environment here (clusters from two to six nodes, and we combine dev
clusters to build bigger ones as we need). What the situation you describe
sounds like is what happens when there's interconnect failure. Each node
thinks independently that its been separated from the rest of the cluster and
(effectively) shoots itself in the head. This causes every instance to
hang. This is why the crafty RAC Jedi designs well their interconnect
architecture.
But
yes, if you're willing to take the "completely 2n capacity" cluster route and
have two databases, double the oracle licenses, two storage arrays, two fibre
channel networks, etc. , that is the highest availability/reliability
cluster you can have - although at the highest cost and
complexity.
Which
clustering solution is right for you? Cheap and inelegant? Expensive
and bullet-proof? Well, that's why we get paid the big bucks, right?
:)
Thanks,
Matt
--
Matthew Zito
GridApp Systems
Email:
[EMAIL PROTECTED]
Cell: 646-220-3551
Phone: 212-358-8211 x 359
http://www.gridapp.com
However, failed transactions must be handled from
client side. Queries may migrate to surviving nodes
transparently.
Also, currently RAC has many problems, such all
nodes hanging when one node dies. Completely separate systems are still (an
will always be) the most available solution.
Tanel.
----- Original Message -----
Sent: Monday, July 28, 2003 7:49
PM
Subject: Re: clustering
Another Important different
is that RAC is best High Availability solution in case of System/Instance
Failure where in case of HP or Veritas Cluster, all of the resource get
stopped on live system/node of the cluster and then get started on second
node and hence user will be affected. But in case of system or Instance
failure, there is seamless transition of the User session in RAC
Indy Johal
|
| "Ron Rogers"
<[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
07/28/03 12:29 PM
Please respond to ORACLE-L
|
To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
cc:
Subject: Re:
clustering |
ak,
As I understand it, an HP cluster is 2
boxes that have the capability
to access the same disks and data but only
one can have the oracle
instance running and accessing the
datafiles(active). Sort of like a
high availability option.
With RAC
both boxes can access the instance and datafiles at the
same
time.
List, Correct me if I need it.
Ron
>>>
[EMAIL PROTECTED] 07/28/03 12:14PM >>>
Hi Guys ,
I am new
to this clustering concept. Just trying to understand few
basics . Need
ur help .
what is differece between oracle running on sun /hp cluster
with 2
nodes and oracle with RAC running on 2 nodes ?
thanks,
-ak
--
Please see the official ORACLE-L FAQ:
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--
Author: Ron Rogers
INET:
[EMAIL PROTECTED]
Fat City Network Services --
858-538-5051 http://www.fatcity.com
San Diego, California
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