Re: Oracle RAC deadman switch on AIX5.3

erikw_nl_at_yahoo.com wrote:
> Hi,
>
> We are using Oracle RAC 10GR2 on AIX 5.3 systems. Since RAC 10GR2 is a
> clustering technique that does not use HACMP anymore for clustering
> functionality, RAC itself has a deadman switch like HACMP to prevent
> cluster isolation.
>
>
> We had several occasions where the AIX system crashed for no obvious
> reason due to the fact that the RAC deadman switch went off. The DBA
> mentioned that problems with interconnect network interface, ocr and
> voting device may provoke RAC to kill the AIX system.
>
>
> Does anybody have experience with this, how can the Oracle timeout
> setting be influenced. Oracle claims that "the settings work as
> designed".
> Recently, when PowerPath redundancy was used during a SAN switch
> reconfiguration, all systems worked fine without any error, except the
> Oracle RAC systems which ALL crashed.
>
>
> Thaks in advance,
>
>
> Erik

You need to look in the log files and see why the node decided to sacrifice itself for the cluster. Without a cause any recommendation would just be a guess.

Daniel Morgan
www.psoug.org Received on Mon May 01 2006 - 16:35:55 CDT