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RHEL 3 heavy load w/ 2 node RAC [message #129013] Thu, 21 July 2005 09:40
kybyrd
Messages: 1
Registered: July 2005
Junior Member
I have been unable to resolve a stubborn, unpredictable problem, with
one node
in a 2 node RAC system(9.2.0.6) experiencing unexplained heavy loads.

The problem surfaced after this system ran with no problems for 3
months.

The "hanging" node will prevent further session creation although
existing
OS processes and oracle sessions continue.

My other node works nornally so databsae access is uninterrupted.

I am running Red Hat AS 3 and I have experienced the problem with
kernels
2.4.21-27 and 2.4.21-32.

The servers are two Dell 1850s.

We are also using an Network Appliance filer NAS
and Cluster Manager.

The problem seems to only occur in the hours from 1am-approx 6am.
There are no cron jobs running at that time that would cause the
hangs.

Nothing that would suggest a cause has been seen in the OS's messages
file or Oracle logs file. Producing an RDA snapshots does not show
anything
of interest.

I have an open TAR with Oracle about this problem with no resolution
from
them yet.

If anyone else has seen this behavior I would like to know what your
determination of the cause was.

Lastly this is my first experience with Oracle RAC so there may
be a configuration item I missed. However since my configuration
ran perfectly for 3 months makes me suspect that that is not the case.
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