|
We
used to experience problems in our RAC environment when there's an interconnect
failure. There's a workaround for that problem, that was worked for us
-
Create a directory under $ORACLE_HOME/rdbms called ".aixopt". Create
(touch) a file called SUSTAIN_IPC_FAILURE (uppercase - 0 byte
file).
We're using 9.2.0.3 2node RAC on AIX 5L / HACMP 4.4
Does
Sun or Tru64 have similar workarounds or does it work flawlessly without the
workaound. Having this workaround tells RAC to make sure atleast there's one
surviving instance in the cluster instead of all instances crashing. Here's the
section from alert log file with an example of handling failures of all 3
interconnects.
Marking down Network with IP 192.168.17.11
Thu Apr 10 23:29:28
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:28
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:28
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:28
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:29
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:29
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:29
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:30
2003
Marking down Network with IP 192.168.18.11
Thu Apr 10 23:29:33
2003
Marking down Network with IP 192.168.19.11
WARNING!!! NO COMMON
NETWORKS FOR ALL NODES TO COMMUNICATE
SUSTAINING IPC
FAILURE
THIS SHOULD BE THE ONLY INSTANCE RUNNING IN THIS
CLUSTER
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: http://www.orafaq.net
--
Author: Ron Rogers
INET:
[EMAIL PROTECTED]
Fat City Network Services --
858-538-5051 http://www.fatcity.com
San Diego, California
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