RE: RAC & failing switch and power issues: more details

From: Matthew Zito <>
Date: Thu, 3 Dec 2009 17:06:51 -0500
Message-ID: <>

This may not work - I don't remember whether the CRS will monitor the physical link state, but if it loses that link state, it very likely could evict itself. I seem to remember seeing some test plans on other OSes where they did get a different result from doing an ifconfig down vs. a hard cable pull.  


[] On Behalf Of
Sent: Thursday, December 03, 2009 4:56 PM To:
Subject: RAC & failing switch and power issues: more details  

More details:

The private switch is truly private; it does not share any traffic with any other network(s).

The plan would be:

  1. shutdown database + CRS on node-2 (passive node)
  2. unplug (or do work on) the switch

Dan Hubler
Database Administrator
Aurora Healthcare
Cerner Support Team
----- Forwarded by Daniel Hubler/HEI/AHC on 12/03/2009 03:54 PM -----

Daniel Hubler/HEI/AHC

12/03/2009 03:34 PM




RAC & failing switch and power issues      

Running a 2-node RAC on AIX (v5.3).
Oracle v10.2.0.3

Application runs in active-passive fashion.

We have issues with:

  1. the switch that is the RAC interconnect
  2. the power being supplied to that same switch

Our current idea is to shut down the passive instance (prod2). We are assuming that this would leave us free to play games with the switch.

Our software vendor is telling is this should be O.K.

Oracle is telling us that if we pull the switch after shutting down PROD2,
that the server running the active instance (PROD1) will "evict itself".

This flies in the face of some testing we did early this year where we simulated loss of the switch
by shutting down the interfaces via ifconfig.

Would love to hear comments opinions about this situation. Thanks in advance.

Dan Hubler
Database Administrator
Aurora Healthcare

Received on Thu Dec 03 2009 - 16:06:51 CST

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