[ILUG] strange RAC behavor (solved)

[Pawel Slabiak]

On 08/23/2010 01:22 PM, Gareth Eason wrote:
> On 22/08/10 15:42, Pawel Slabiak wrote:
>    
>> Hi Guys,
>>
>> I have very strange issue with Oracle RAC (real application cluster)
>> under SLES10.3 .As far as I know RAC and the basic idea behind each
>> cluster, if one of nodes is down, than other should take over all
>> preconfigured services or applications.
>> In my case if I simply reboot on of those nodes, than after a while
>> another is also down.Very strange, isn't it ?
>> I checked already all parameters and everything seems to be correct.
>>
>> Any hints and ideas would be appreciated.
>>      
> [snip]
>
> 	That is indeed the point of RAC - you should be able to turn off nodes and
> the traffic will (after a short period) redirect to the other available node(s).
>
> 	Can you define "a while" and what you mean by 'reboot' and how you're
> determining that a node is 'down?' Any logs you have and a broad description
> of what it is you're trying to do and what you're doing it on would be helpful
> too. Don't forget to include details like whether they are using shared
> back-end storage and what type that is (SAN/NAS/DAS?) Many problems with RAC
> stem from issues in shared storage.
>
> 	Best regards,
> 	-->Gar
>    

Hi Gareth,

thank you very much for your reply. I fixed already this problem by my self.
The issue was the start-stop script under /etc/init.d/ocfs2 which was 
simply disabled.The consequence was, that when I rebooted one of those 
2-nodes cluster,
after 50 seconds the second crashed.The solution was not so easy to 
figure out actually.
Before I altered the state of this scripts (chkconfig --add ocfs2) after 
each reboot the ocfs2 file system have been umounted quick and dirty.
Further information under :

http://oss.oracle.com/projects/ocfs2/dist/documentation/v1.2/ocfs2_faq.html#QUORUM

best regards from (rainy) Hamburg



-- 
Pawel Slabiak Linux Services
Systemingenieur
http://www.linux-services.org
mailto: p.slabiak at linux-services.org

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